By Col Vijayant Thakur (Retd) · Defence faculty, The Cavalier
Why does the Army have six operational commands, why does the Navy keep warships on station far from home, and why is a road tunnel counted as a defence project? The answer in each case is geography. India has a 15,106.7 km land border with seven neighbours that runs from glacier to desert to jungle, an 11,098.81 km coastline with island territories that reach towards the Malacca Strait, and the Indian Ocean, which carries the country's trade. For a candidate this is the home of the "border", "pass", "channel" and "island" questions in the GK paper, and of the lecturette and group-discussion topics in the interview.
This is the strategic geography hub of our Defence GK library: official figures, the LoC, LAC and AGPL in neutral wording, the high terrain, the sea, and a guide to the two detailed pages.
Why Geography Drives Defence
- The land frontier is four kinds of border. Desert and plains in the west, Himalaya and Karakoram in the north, forested hills in the north-east and open river borders in the east each need a different force, so one force is assigned to each border.
- Height is a weapon and a burden. Passes above 11,000 feet are snowbound for months, so roads and tunnels decide how fast supplies move.
- The sea is the third frontier. The peninsula points into the Indian Ocean, and the Andaman and Nicobar Islands sit beside some of its busiest shipping lanes.
The land frontier is split across the Army's operational commands, the sea frontier is run through the Navy's fleet operations and the Indian Coast Guard, and the one geographic command of all three services was built for an island chain: see the tri-service section.
The Land Borders: Length, Guarding Force and States
The Ministry of Home Affairs (Department of Border Management) gives the total as 15,106.7 km. The seven figures below are the MHA's own, and they add up to that total. The guarding forces follow the MHA's "one border, one border-guarding force" principle.
| Neighbour | Length (km) | Border-guarding force | States / UTs along it (MHA) |
|---|---|---|---|
| Bangladesh | 4,096.7 (longest) | BSF | West Bengal, Assam, Meghalaya, Tripura, Mizoram |
| China | 3,488 | ITBP | Ladakh (UT), Himachal Pradesh, Uttarakhand, Sikkim, Arunachal Pradesh |
| Pakistan | 3,323 | BSF on the International Border; the Army guards the LoC alongside the BSF (MHA Annual Report 2023-24) | Gujarat, Rajasthan, Punjab, J&K (UT), Ladakh (UT) |
| Nepal | 1,751 | SSB | Uttarakhand, Uttar Pradesh, Bihar, West Bengal, Sikkim |
| Myanmar | 1,643 | Assam Rifles | Arunachal Pradesh, Nagaland, Manipur, Mizoram |
| Bhutan | 699 | SSB | Sikkim, West Bengal, Assam, Arunachal Pradesh |
| Afghanistan | 106 | Not separately listed by the MHA | Ladakh (UT), on India's stated position |
| Total | 15,106.7 | Counting the MHA lists, 16 States and 2 UTs touch a land border | |
Three notes. The MHA lists both Jammu and Kashmir and Ladakh (Union Territories) along the Pakistan border, in line with India's position that the whole of both is Indian territory. Older MHA annual reports (2008-09, 2009-10) said the Pakistan figure includes the LoC in Jammu and Kashmir; recent ones omit that note. The ITBP guards the China border, with the Army also deployed along the LAC. The Assam Rifles is administered by the MHA, with operational control resting with the Army. Each force has its own entry on the CAPF page.
Older publications give Pakistan as 3,244 km and Bangladesh as 4,351 km. The table uses the MHA's current figures, and UPSC follows official figures. Arunachal Pradesh, West Bengal, Sikkim and Ladakh each touch three countries in the table above; Tripura and Meghalaya touch only Bangladesh.
IB, LoC, LAC and AGPL: Four Lines, Four Meanings
"Border" is not one idea: the word for each stretch tells you how it came about. The wording follows what the Government of India has officially stated.
| Term | Where | What it is |
|---|---|---|
| International Border (IB) | With Bangladesh, Nepal, Bhutan and Myanmar; with Pakistan from Gujarat to the Jammu sector | A boundary fixed by treaty or award and marked on the ground. The Punjab and Bengal alignments come from the Radcliffe award of August 1947 |
| Line of Control (LoC) | Jammu and Kashmir, between India and Pakistan | The line from the ceasefire of 17 December 1971, which the Simla Agreement of 2 July 1972 says both sides shall respect, without prejudice to either side's recognised position, and not alter unilaterally |
| Line of Actual Control (LAC) | India-China border, in three sectors: western (Ladakh), middle (Himachal Pradesh and Uttarakhand), eastern (Sikkim and Arunachal Pradesh) | Not commonly delineated: India has told Parliament that the two sides hold different perceptions of it. The term appears in the 1993 and 1996 agreements on peace and confidence-building |
| Actual Ground Position Line (AGPL) | Siachen Glacier, north of the point where the LoC ends | The line of the positions actually held by the two armies on the glacier, not a delimited boundary |
India's stated position, set out in Parliament's resolution of 22 February 1994, is that the whole of Jammu and Kashmir is an integral part of India. In the east, India regards the 1914 McMahon Line as the boundary in Arunachal Pradesh, a view China does not share. Do not confuse these with the Durand Line, which divides Afghanistan and Pakistan. The sector-by-sector story is on the borders, LAC and LoC page.
High-Altitude Terrain: Siachen, Passes and Tunnels
Siachen is a glacier in the eastern Karakoram, in the Nubra Valley region of Ladakh. PIB describes it as the world's highest battlefield. Operation Meghdoot began on 13 April 1984, when the Army, supported by IAF airlift and helicopters, moved onto the heights of the glacier. IAF Chetak helicopters had been flying there since 1978. The operation is told on its own page, Operation Meghdoot.
| Pass | State / UT | Remember |
|---|---|---|
| Zoji La | Between J&K and Ladakh (UTs) | 11,650 ft; Srinagar-Kargil-Leh road; the BRO kept winter 2022-23 closure to 68 days against 160-180 earlier (PIB) |
| Khardung La | Ladakh | Leads to the Nubra Valley |
| Rohtang | Himachal Pradesh | Pir Panjal; bypassed by the Atal Tunnel |
| Shipki La | Himachal Pradesh (Kinnaur) | Satluj Valley; border-trade point with China |
| Lipulekh | Uttarakhand | Border-trade point with China and a Kailash Mansarovar Yatra route |
| Nathu La and Jelep La | Sikkim | Nathu La is a border-trade point; both lead to the Chumbi Valley |
| Bomdi La | Arunachal Pradesh | On the Tawang approach |
West to east: Bara Lacha La and Shipki La (Himachal Pradesh), Jelep La (Sikkim), Bomdi La (Arunachal Pradesh). Bolan, sometimes paired with these, is in Pakistan.
| Tunnel | Where | Facts (PIB) |
|---|---|---|
| Atal Tunnel | Beneath Rohtang Pass, Manali to Lahaul-Spiti | 9.02 km; about 10,000 ft; opened 3 October 2020; keeps Lahaul-Spiti connected in winter |
| Sela Tunnel | Tezpur-Tawang route, Arunachal Pradesh | Built by the BRO at 13,000 ft; dedicated on 9 March 2024; cost Rs 825 crore; all-weather link to Tawang |
| Zojila Tunnel | Beneath Zoji La, Srinagar-Leh road | Under construction; PIB (January 2026) gives 2028; see our report on the June 2026 breakthrough |
The BRO, the Ministry of Defence's road builder, has its own Border Roads Organisation page. The Vibrant Villages Programme was launched on 10 April 2023 at Kibithoo, Arunachal Pradesh. Phase I covers 662 villages on the northern border (Arunachal Pradesh, Himachal Pradesh, Sikkim, Uttarakhand, Ladakh) with Rs 4,800 crore. Phase II, approved on 2 April 2025 and launched on 20 February 2026 at Nathanpur, Cachar, extends it to the other land borders: 1,954 villages and Rs 6,839 crore. Together PIB counts more than 2,616 villages and Rs 11,639 crore (6 September 2026). Our report on Vibrant Villages Programme-II explains why India is building up its border villages.
Coastline, Islands and the EEZ
India's coastline was re-assessed from 7,516.6 km to 11,098.81 km by the National Hydrographic Office with the Survey of India, using modern GIS software and high-resolution high-water-line data. The Ministry of Ports, Shipping and Waterways promulgated the revised length on 29 April 2025, and the Ministry of Earth Sciences gave the state-wise figures to Parliament on 4 December 2025 (PIB).
| State / UT | Old (km) | Revised (km) |
|---|---|---|
| Gujarat (longest of the States) | 1,214.70 | 2,340.62 |
| Andaman and Nicobar Islands (UT) | 1,962.00 | 3,083.50 |
| Andhra Pradesh (third among States, after Gujarat and Tamil Nadu) | 973.7 | 1,053.07 |
| Lakshadweep (UT) | 132 | 144.8 |
| India | 7,516.6 | 11,098.81 |
Older books use 7,516.6 km; PIB and the MHA now use 11,098.81 km. PIB says the new figure comes from modern GIS software and high-resolution high-water-line data, not new land. UPSC follows official figures: use 11,098.81 km now and recognise 7,516.6 km in older questions.
Islands. The Andaman and Nicobar Islands in the Bay of Bengal number 836 islands, islets and rocky outcrops by the UT administration's count (older books say 572 islands). Indira Point on Great Nicobar is the southernmost tip of India, and PIB places it along the Great Channel, popularly the Six Degree Channel, a major international shipping lane. The islands host the only tri-service geographic command, on the Andaman and Nicobar Command page. Lakshadweep in the Arabian Sea has 36 islands, ten inhabited, 220 to 440 km from Kochi. Minicoy, its southernmost island, faces the Eight Degree Channel towards the Maldives.
Maritime zones (UNCLOS and India's 1976 maritime zones law), measured from the baseline:
| Zone | Limit | India's rights |
|---|---|---|
| Territorial sea | 12 nautical miles | Sovereignty, with innocent passage for foreign ships |
| Contiguous zone | 24 nautical miles | Customs, fiscal, immigration and sanitary enforcement |
| Exclusive Economic Zone | 200 nautical miles (about 370 km) | Exclusive rights over living and mineral resources; navigation and cable-laying stay free for others |
The textbook figure is 2.02 million sq km, found in older PIB material. PIB's release of 22 November 2024 on the Sea Vigil 24 exercise gives 2.4 million sq km. Use 2.4 million for a current answer.
Indian Ocean Chokepoints at a Glance
A chokepoint is a narrow passage that a large share of shipping must use. India's trade and energy pass through several, and the Andaman and Nicobar and Lakshadweep channels are India's own. Detail and island bases are on the chokepoints and bases page.
| Chokepoint | Connects | Why it matters |
|---|---|---|
| Strait of Malacca | Andaman Sea and Indian Ocean with the South China Sea | The shortest sea route between the Indian Ocean and the Pacific; the Andaman and Nicobar Islands sit at its western approach |
| Strait of Hormuz | Persian Gulf with the Gulf of Oman and Arabian Sea | The exit for Gulf oil, gas and LPG; the Navy's data counts 130-140 transits a day in normal times |
| Bab-el-Mandeb | Red Sea with the Gulf of Aden | With the Suez Canal, the Europe route; Navy anti-piracy deployments in the Gulf of Aden since 2008 |
| Mozambique Channel | Mozambique and Madagascar, western Indian Ocean | Shipping on the Cape route; part of India's wider Indian Ocean neighbourhood |
| Sunda and Lombok Straits | Indian Ocean with the Java Sea, through Indonesia | Alternatives to Malacca when it is crowded or closed |
| Six Degree Channel (Great Channel) | Great Nicobar and Sumatra | Indira Point lies along it; a lane to Malacca |
| Ten Degree Channel | Little Andaman and Car Nicobar | Separates the Andaman group from the Nicobar group |
| Eight and Nine Degree Channels | Minicoy and the Maldives (Eight); Minicoy and the main Lakshadweep group (Nine) | West-coast lanes through Lakshadweep |
A Lok Sabha reply of 2 February 2024 (PIB) says Navy units are regularly deployed on Mission Based Deployments in India's areas of interest in the Indian Ocean Region; anti-piracy patrols off the Gulf of Aden and East Africa since 2008 have escorted 3,440 ships. The fleets behind this are on the fleet operations page.
SAGAR, Security and Growth for All in the Region, dates from 2015. On 12 March 2025 in Mauritius the Prime Minister said the vision for the Global South would go beyond it and be MAHASAGAR, Mutual and Holistic Advancement for Security and Growth Across Regions: trade for development, capacity building and mutual security. Our report on MAHASAGAR and the Navy Chief's Mauritius visit explains it. Cooperation with partner navies is under defence agreements; sea exercises are on the military exercises page.
- 29 Apr 2025: revised coastline length of 11,098.81 km promulgated; stated in Parliament on 4 Dec 2025.
- 28 Feb 2026 onwards: the Navy's IFC-IOR update for March 2026 records a sharp deterioration in maritime security in the Arabian Gulf, Hormuz and Gulf of Oman, with Hormuz traffic down by over 90 per cent.
- 14-17 Apr 2026: the Indian Navy Maritime Security Strategy (INMSS-2026) was released at the Naval Commanders' Conference.
Pages in This Section
| Page | What it covers |
|---|---|
| Borders, LAC and LoC | IB, LoC, LAC, AGPL and the McMahon Line side by side; the sectors of the China border; who guards which border |
| Indian Ocean Chokepoints and Bases | Malacca, Hormuz, Bab-el-Mandeb and the Degree Channels in depth; island bases; SAGAR and MAHASAGAR |
Exam pins
- Total land border: 15,106.7 km with seven neighbours (MHA).
- Bangladesh 4,096.7 (longest), China 3,488, Pakistan 3,323, Nepal 1,751, Myanmar 1,643, Bhutan 699, Afghanistan 106.
- Guarding forces: BSF (Pakistan, Bangladesh), ITBP (China), SSB (Nepal, Bhutan), Assam Rifles (Myanmar).
- LoC comes from the 17 December 1971 ceasefire line and the Simla Agreement, 2 July 1972; the LAC is not commonly delineated; the AGPL is on Siachen.
- Coastline: 11,098.81 km (revised from 7,516.6 km); Gujarat has the longest coastline of any State; Andhra Pradesh is third.
- Indira Point on Great Nicobar is the southernmost tip; the Six Degree Channel (Great Channel) lies along it.
- Ten Degree Channel: Little Andaman and Car Nicobar; Eight Degree: Minicoy and the Maldives.
- EEZ: 200 nautical miles; navigation and cable-laying are not exclusive to the coastal State.
- Shipki La is in Himachal Pradesh (Satluj Valley); Nathu La and Jelep La are in Sikkim; Bolan is in Pakistan.
- Atal Tunnel (9.02 km, 3 Oct 2020) and Sela Tunnel (13,000 ft, 9 Mar 2024); Operation Meghdoot: 13 April 1984.
Asked in past papers
Each of these can be answered from the tables above.
Ten Degree Channel is found between:
(a) North Andaman and Middle Andaman (b) South Andaman and Little Andaman (c) Little Andaman and Car Nicobar (d) Car Nicobar and Great Nicobar
Answer: (c). It separates the Andaman group from the Nicobar group, so the two islands come from different groups. (a) and (b) are both Andaman islands; (d) is both Nicobar.
The Eight Degree Channel separates which of the following?
(a) India from Sri Lanka (b) Lakshadweep from Maldives (c) Andaman from Nicobar Islands (d) Indira Point from Indonesia
Answer: (b). It runs between Minicoy and the Maldives. (c) is the Ten Degree Channel; (d) is the Six Degree Channel, off Indira Point.
'Shipki La', a high altitude pass in the Himalayas, is located in:
(a) Chumbi Valley (b) Brahmaputra Valley (c) Satluj Valley (d) Teesta Valley
Answer: (c). Shipki La is in Kinnaur, Himachal Pradesh, where the Satluj enters India. The Chumbi Valley is the Tibetan side of Nathu La and Jelep La in Sikkim.
Which one of the following Indian states does NOT share international border with two or more countries?
(a) Arunachal Pradesh (b) Assam (c) Mizoram (d) Tripura
Answer: (d). Tripura touches only Bangladesh. Arunachal touches China, Bhutan and Myanmar; Assam, Bangladesh and Bhutan; Mizoram, Bangladesh and Myanmar.
Which one of the following is not an exclusive right of the concerned coastal nations over Exclusive Economic Zone (EEZ)?
(a) Survey and exploitation of mineral resources of ocean deposits (b) Exploitation of marine water energy and marine organisms including fishing (c) Conservation and management of marine resources (d) Navigation of ships and laying down submarine cables
Answer: (d). The coastal State holds the resource rights in (a), (b) and (c); other States keep the freedom of navigation and cable-laying.
Questions ask for pairings: channel and the islands it divides, pass and its valley, State and its neighbours. Learn them in pairs and test each against the near-miss option (Eight versus Ten Degree, Satluj versus Chumbi). Practise on the CDS and NDA past-paper pages, with our notes on ocean relief and islands, Indian physiography and straits and canals.
Practice MCQs (with answers)
- Which force is the border-guarding force on the India-China border?
- Border Security Force
- Indo-Tibetan Border Police
- Sashastra Seema Bal
- Assam Rifles
- The Line of Control in Jammu and Kashmir is the line the two sides agreed to respect under which agreement?
- Tashkent Declaration, 1966
- Lahore Declaration, 1999
- Simla Agreement, 1972
- Karachi Agreement, 1949
- According to the Ministry of Home Affairs, which neighbour has the longest land border with India?
- Bangladesh
- China
- Pakistan
- Nepal
- The Sela Tunnel, dedicated to the nation in March 2024, gives all-weather connectivity to
- Leh
- Kargil
- Gangtok
- Tawang
- The Atal Tunnel bypasses which pass?
- Zoji La
- Rohtang Pass
- Banihal Pass
- Nathu La
- Indira Point, the southernmost tip of India, lies along which channel?
- Eight Degree Channel
- Palk Strait
- Six Degree (Great) Channel
- Ten Degree Channel
1-b, 2-c, 3-a, 4-d, 5-b, 6-c. Q2: the Karachi Agreement of 1949 set an earlier, different ceasefire line. Q3: Bangladesh at 4,096.7 km, ahead of China at 3,488 km. Q5: the Atal Tunnel runs beneath Rohtang; the Zojila Tunnel, under Zoji La, is still being built. Q6: the Ten Degree Channel is in the island chain but far north of Indira Point.
Where to Go Next
In the interview, geography turns up as "the India-China border", "why the Indian Ocean matters" and "border villages"; practise with our group discussion guide. For the sea, read career in the Indian Navy. Graduates can join the CDS course, Class 12 candidates the NDA batches; the daily defence notes track new border and maritime news. The next step in this section is the borders page.
Frequently asked questions
How long is India's land border and which neighbour has the longest border?
India's land border is 15,106.7 km, according to the Ministry of Home Affairs. Bangladesh has the longest stretch at 4,096.7 km, followed by China (3,488 km), Pakistan (3,323 km), Nepal (1,751 km), Myanmar (1,643 km), Bhutan (699 km) and Afghanistan (106 km).
What is the difference between the LoC, the LAC and the International Border?
The International Border is fixed by treaty or award and marked on the ground. The Line of Control in Jammu and Kashmir comes from the 17 December 1971 ceasefire line, respected under the Simla Agreement of 1972. The Line of Actual Control with China is not commonly delineated, and the two sides hold different perceptions of it.
How long is India's coastline?
The Ministry of Earth Sciences told Parliament on 4 December 2025 that India's coastline has been re-assessed from 7,516.6 km to 11,098.81 km by the National Hydrographic Office with the Survey of India. PIB says the new figure uses modern GIS software and high-resolution high-water-line data. Older books use 7,516.6 km.
Which forces guard India's borders?
The BSF guards the Pakistan and Bangladesh borders, the ITBP the China border, the SSB the Nepal and Bhutan borders and the Assam Rifles the Myanmar border. The Army also guards the Line of Control alongside the BSF and is deployed along the LAC, where the ITBP is the border-guarding force. The Navy and the Coast Guard are responsible for the sea frontier.
Why are Indian Ocean chokepoints important for India's defence?
Most of India's trade and much of its oil and gas pass through straits such as Malacca, Hormuz and Bab-el-Mandeb. The Navy therefore keeps ships on Mission Based Deployments across the Indian Ocean Region. The Andaman and Nicobar Islands also sit at the western approach to Malacca.
More in Defence GK
Sources: mha.gov.in/en/divisionofmha/border-management-ii-division · pib.gov.in/PressReleasePage.aspx?PRID=2198800 · pib.gov.in/PressReleasePage.aspx?PRID=2076147 · static.pib.gov.in/WriteReadData/specificdocs/documents/2026/sep/doc_9806_20260906_10533201.pdf
Preparing for CDS or OTA?
Cavalier's CDS/OTA batches teach the whole GK paper, defence awareness included, with PYQ drills, weekly tests and SSB training.