Indian Geographical Extent and Frontiers

Indian Geographical Extent and Frontiers

India is a vast country, India is located entirely in the northern hemisphere; specifically in the south-central part of the continent of Asia, the mainland extends between latitudes 8°4’N and 37°6’N and longitudes 68°7’E and 97°25’E, area of the world.

As the 7th largest country in the world, India stands apart from the rest of Asia, marked off as it is by mountains and the sea, which gives the country a distinct geographical entity.

India is located entirely in the northern hemisphere

India has a land boundary of about 15,200 km and the total length of the coastline of the mainland, including Andaman and Nicobar and Lakshadweep, is 7,516.6 km.

India is bounded by the young fold mountains in the northwest, north, and northeast. South of about 22° north latitude, it begins to taper and extends towards the Indian Ocean, dividing it into two seas, the Arabian Sea on the west and the Bay of Bengal on its east.

The latitudinal and longitudinal extent of the mainland is about 30°. Despite this fact, the east-west extent appears to be smaller than the north-south extent.

latitude of india map

From Gujarat to Arunachal Pradesh, there is a time lag of two hours. Hence, time along the Standard Meridian of India (82°30’E) passing through Mirzapur (in Uttar Pradesh) is taken as the standard time for the whole country. The latitudinal extent influences the duration of day and night, as one moves from south to north.

The Tropic of Cancer passes through eight states in IndiaGujarat (Jasdan), Rajasthan (Kalinjarh), Madhya Pradesh (Shajapur), Chhattisgarh (Sonhat), Jharkhand (Lohardaga), West-Bengal (Krishnanagar), Tripura (Udaipur) and Mizoram (Champhai).

tropic of cancer passes through

Size and Extent –

East-West Extent of Main Land India (Including Pak occupied Kashmir-POK):68° 7′ east to 97° 25′ east longitude
South-North Extent of Main Land India:8° 4′ north to 37° 6′ north latitude
Locational Extent:8° 4′ N to 37° 6′ N latitude and 68° 7′ E to 97° 25′ East longitude.
  • The southernmost point of the country is the Pygmalion Point or Indira Point is located at 6° 45′ N latitude.
  • The north-south extent from Indira Col in Kashmir to Kanniyakumari is 3,214 km.
  • East-west width from the Rann of Kachachh to Arunachal Pradesh is 2,933 km.
  • With an area of 32,87,263 sq km, India is the seventh-largest country in the world.
  • India accounts for about 2.4 percent of the total surface area of the world.
  • The Tropic of Cancer passes through the middle of the country dividing it into two latitudinal halves.
  • The area to the north of Tropic of Cancer is nearly twice the area which lies to the south of it.
  • South of 22° north latitude, the country tapers off over 800 km into the Indian Ocean as a peninsula.
Jammu and Kashmir pakistan and china occupied territories
Indira col NJ9842 siachen glacier

Coastline of India

India is a country that is surrounded by the sea on three of its sides. The coastal plains in India are along the west and east of the country.  Extending up to 7516.6 km, the coastal plains in India are of two types:

  1. Eastern Coastal Plains of India
  2. Western Coastal Plains of India

Eastern Coastal Plains of India

The eastern coastal plains stretch from West Bengal in the north to Tamil Nadu in the south and pass through Andhra Pradesh and Odisha. Deltas of the rivers Mahanadi, Krishna, Godavari, and Cauveri are present in the eastern coastal plain. The deltas are very fertile and productive for agriculture. Therefore, the delta of the River Krishna is called the ‘Granary of South India‘. The Eastern coast is again divided into three categories:

  • Utkal coast: Extending between the Chilika Lake and Kolleru Lake, they are much wider than the western coastal plains and undergo immense rainfall. Some of the crops that are cultivated here are rice, coconut, and banana.
  • Andhra coast: Extending between the Kolleru Lake and Pulicat Lake, the Andra coast forms a basin area for the Krishna and the Godavari rivers.
  • Coromandel coast: The Coromandel coast extends between Pulicat Lake and Kanyakumari in Tamil Nadu. This Indian coastline remains dry in summer and receives rainfall during the winter due to the north-east monsoons.

Chilka lake and the Pulicat lake (lagoon) are the important geographical features of east coast.

Western Coastal Plains of India

Western Coastal Plains stretches from Kerala in the south to Gujarat in the north passing through Karnataka, Goa, and Maharashtra. The western coastal plains stretch for 1500 km north to south and its width ranges from 10 to 25 km. The West Continental Shelf is at its widest off the Bombay coast. This place is rich in oil. Along the Malabar Coast, there are many beautiful lagoons that make the place a tourist destination. The western coast is narrower than the eastern coast.

The western coast is further divided into four categories:

  • Kachchh and Kathiawar coast: Kachchh, formerly a gulf is formed by the deposition of silt by the Indus. The area of Kachchh is covered with shallow water during the monsoons and is divided into Great Rann in the north and Little Rann in the east. Whereas, Kathiawar is situated to the south of Kachchh.
  • Konkan coast: It extends between Daman in the north to Goa in the south. Rice and cashew are the two important crops of this region.
  • Kanada coast: It extends between Marmagaon and Mangalore and is rich in iron deposits.
  • Malabar coast: Extending between Mangalore to Kanyakumari, the Malabar coast is relatively broad. This region also consists of lagoons running parallel to the coast in southern Kerala.

Konkan coast = Maharashtra coast and Goa coast;
Malabar Coast = Kerala and Karnataka coast.

India's coastline
10 channel duncan passage 8 channel and 9 channel

Standard Time (Time Zone)

Every place on Earth is measured in terms of its distance east or west of the prime meridian (0 longitude) in Greenwich, London, United Kingdom. This is also the reference point for Coordinated Universal Time (UTC) with 1 hour per 15 degrees longitude.

For Example:

At 150 degrees west (or 150 W) longitude, the time should be 150 degrees divided by 15 degrees = 10 hours behind UTC, or UTC-10.

In India 8230 E has been taken as the reference for Indian Standard Time (IST), which means India is ahead of UTC by 5hr and 30 minutes.

Indian Standard Meridian passes through Uttar PradeshMadhya Pradesh, Chhattisgarh, Odisha and Andhra Pradesh.

Indian Standard Meridian

India, Tropical or Temperate Country?

  • The temperate part (north of Tropic of Cancer) is twice the area of tropical part.
  • But India has always been treated as a tropical country for two different reasons – physical and cultural.

Physical Geographical Reasons

  • The country is separated from the rest of Asia by Himalayas.
  • Its climate is dominated by the tropical monsoons and the temperate air masses are blocked by Himalayas.
  • Entire area south of the Himalayas is essentially tropical from climatic point of view: Although the night temperatures in Winter at several places in North India may come down to the level of those prevailing in temperate lands, yet clear skies and intense insolation raise the day temperatures to a tropical level.

Cultural Geographical Reasons

  • Settlements, diseases, agricultural and primary economic activities are all tropical in nature.

India’s Frontiers

Reference: Ministry Of Home Affairs

  • India has 15106.7 Km of land border running through 92 districts in 17 States and a coastline of 7516.6 Km [6100 km of mainland coastline + coastline of 1197 Indian islands] touching 13 States and Union Territories (UTs).
  • Barring Madhya Pradesh, Chhattisgarh, Jharkhand, Delhi, Haryana, and Telangana, all other States in the country have one or more international borders or a coastline and can be regarded as frontline States from the point of view of border management.
  • India’s longest border is with BANGLADESH while the shortest border is with Afghanistan.
  • The length of India’s land borders with neighboring countries is as under:
India’s land borders with neighboring countries
Ministry Of Home Affairs
india land border
Ministry Of Home Affairs

Border with China

  • This is the second longest border of India, next only to its border with Bangladesh.
  • Five Indian states, namely Jammu and Kashmir, Himachal Pradesh, Uttarakhand, Sikkim and Arunachal Pradesh touch the Indian boundary with China.
  • The Sino-Indian border is generally divided into three sectors namely : (i) the Western sector, (ii) the Middle sector, and (iii) the Eastern sector.

The Western Sector

  • Separates Jammu and Kashmir state of India from the Sinkiang (Xinjiang) province of China.
  • The western sector boundary is largely the outcome of the British policy towards the state of Jammu and Kashmir.
  • China claims the Aksai Chin district, the Changmo valley, Pangong Tso and the Sponggar Tso area of north-east Ladakh as well as a strip of about 5,000 sq km down the entire length of eastern Ladakh.
  • China also claims a part of Huza-Gilgit area in North Kashmir (ceded to it in 1963 by Pakistan).
indo china border dispute

The Middle Sector

  • Two Indian states of Himachal Pradesh and Uttarakhand touch this border.

The Eastern Sector

  • The 1,140 km long boundary between India and China runs from the eastern limit of Bhutan to a point near Diphu pass (Talu Pass) at the trijunction of India, Tibet, and Myanmar.
  • This line is usually referred to as the Mc Mahon Line after Sir Henry Mc Mahon, then foreign secretary of British India, who negotiated the boundary agreement between Great Britain and Tibet at Shimla accord in 1913-14.
line of actual control
Disputed Territories

Western Sector

  • In the western sector, India shares about 2152 km long border with China.
  • It is between the Union Territory of Ladakh (erstwhile state of Jammu and Kashmir) and Xinjiang Province of China.
  • In this sector, there is a territorial dispute over Aksai Chin. India claims it as part of erstwhile Kashmir, while China claims it is part of Xinjiang.
  • The dispute over Aksai Chin can be traced back to the failure of the British Empire to clearly demarcate a legal border between China and its Indian colony.
  • During the time of British rule in India, two borders between India and China were proposed- Johnson’s Line and McDonald Line.
    • The Johnson’s line (proposed in 1865) shows Aksai Chin in erstwhile Jammu and Kashmir (now Ladakh) i.e. under India’s control whereas McDonald Line (proposed in 1893) places it under China’s control.
    • India considers Johnson Line as a correct, rightful national border with China, while on the other hand, China considers the McDonald Line as the correct border with India.
  • At present, the Line of Actual Control (LAC) is the line separating Indian areas of Ladakh from Aksai Chin. It is concurrent with the Chinese Aksai Chin claim line.

Middle Sector

  • In this sector, India shares about 625 km long boundary with China which runs along the watershed from Ladakh to Nepal.
  • Himachal Pradesh and Uttarakhand touch this border with Tibet (China) in this sector. Both sides do not have much disagreement over the border in this area.

Eastern Sector

  • In this sector, India shares a 1,140 km long boundary with China.
  • It runs from the eastern limit of Bhutan to a point near the Talu Pass at the trijunction of Tibet, India, and Myanmar.
  • This boundary line is called McMahon Line.
  • China considers the McMahon Line illegal and unacceptable claiming that Tibetan representatives who had signed the 1914 Convention held in Shimla which delineated the McMahon line on the map were not having rights to do so.

The India-Nepal Boundary

  • Five states of India, namely Uttarakhand, Uttar Pradesh, Bihar, West Bengal, and Sikkim touch the Nepalese border with India. The border is a porous one with the unrestricted movement of goods and people between Indian and Nepal.
  • A major portion of the Indo-Nepalese border runs in the east-west direction almost along the foothill of the Shiwalik Range.
Disputed Territories
  • Kalapani: Kalapani is a valley that is administered by India as a part of the Pithoragarh district of Uttarakhand. It is situated on the Kailash Mansarovar route. The latest political map of India reiterated the Indian claims on the region that Nepal says belongs to its westernmost part. India claims the historic region as part of Uttarakhand.
    • The Kali River in the Kalapani region demarcates the border between India and Nepal.
    • The Treaty of Sugauli signed by the Kingdom of Nepal and British India (after the Anglo-Nepalese War) in 1816 located the Kali River as Nepal’s western boundary with India. The discrepancy in locating the source of the river led to boundary disputes between India and Nepal, with each country producing maps supporting their own claims.
  • Susta: Susta area is one of the disputed territories between India (Uttar Pradesh) and Nepal.
    • Susta is located on the bank of the Gandak river (called Narayani river in Nepal).
    • The change of course by the Gandak river is the main reason for disputes in the Susta area.
    • According to the Sugauli Treaty signed between British East India Company and Nepal in 1816, the Gandak river is the international boundary and eastern part of the river belongs to India and western part of the river belongs to Nepal. At the time the treaty was signed Susta village was situated west of the river. But, over the years, the Gandak river changed its course and Susta moved to the east side of the river, that is now on the Indian side of the river.
susta region in map upsc

The India-Bhutan Boundary

  • Quite peaceful border and there is no boundary dispute between the two countries.
india bhutan boundary

The Indo-Pakistan Boundary

  • The Indo-Pakistan boundary is the result of the partition of the country in 1947 under the Radcliffe award of which Sir Cyril Radcliffe was the chairman.
  • Jammu and Kashmir, Sir Creek are the major disputed regions.
Sir Creek india pakistan disputed
Disputed Territories
  • Jammu and Kashmir, Pakistan-occupied Kashmir and Gilgit-Baltistan: Pakistan is in the illegal and forcible occupation of approximately 78,000 sq. km of Indian Territory in Jammu and Kashmir. In addition, under the so-called Sino-Pakistan Boundary Agreement of 1963, Pakistan illegally ceded 5,180 sq. km in Pakistan Occupied Kashmir to China.
  • Siachen Glacier: The Siachen Glacier is located in the eastern Karakorams in the Himalayas just east of the Actual Ground Position Line between India-Pakistan.
    • The entire Siachen Glacier, with all major passes, is currently under the administration of India since 1984 (Operation Meghdoot).
  • Saltoro Ridge: The Saltoro Mountains mountain range is a subrange of the Karakoram Heights or of Saltoro Ridge. They are located in the heart of the Karakoram, on the southwest side of the Siachen Glacier.
    • They are claimed as part of Jammu and Kashmir Union Territory by India and as part of Gilgit-Baltistan by Pakistan.
    • In 1984, India assumed military control of the main peaks and passes of the range, with Pakistani forces into the glacial valleys just to the west.
  • Sir Creek: It is a 96 km long strip of water disputed between India and Pakistan in the Rann of Kutch marshlands.
    • Pakistan claims the line to follow the eastern shore of the estuary while India claims a centerline (differing interpretations of paragraphs 9 and 10 of the Bombay Government Resolution of 1914 signed between the then Government of Sindh and Rao Maharaj of Kutch).
    • The International Boundary in the Sir Creek area and International Maritime Boundary line (IMBL) between India and Pakistan have not been demarcated.
sir creek dispute upsc
indo pak border

The India-Bangladesh Border

  • India’s 4,096 km long border with Bangladesh is the longest.
  • This boundary has been determined under the Radcliffe Award which divided the erstwhile province of Bengal into two parts.
Indo Bangladesh border
indo bangladesh new boundary

India-Myanmar Boundary

  • This boundary runs roughly along the watershed between the Brahmaputra and Ayeyarwady [Irrawaddy].
  • It passes through thickly forested regions, with Mizo Hills, Manipur, and Nagaland on the Indian side and Chin Hills, Naga Hills, and Kachin state on the Myanmar side.
north east zone
golden triangle

India-Sri Lanka Boundary

  • India and Sri Lanka are separated from each other by a narrow and shallow sea called Palk Strait.
  • Dhanushkodi on the Tamil Nadu coast in India is only 32 km away from Talaimanar in the Jaffna peninsula in Sri Lanka. These two points are joined by a group of islets forming Adam’s Bridge.
    • Though, by and large, peace has reigned where the Indo-Sri Lanka border issue is concerned, there were tensions over the question of who owned Kachchatheevu Island in the Palk Strait. It was given by India to Sri Lanka in 1974.
India Sri Lanka
india sri lanka maritime boundary
India Physical Map
India Physical Map

Do you Know

  •  The Equator passes through 13 countries: Ecuador, Colombia, Brazil, Sao Tome & Principe, Gabon, Republic of the Congo, the Democratic Republic of the Congo, Uganda, Kenya, Somalia, Maldives, Indonesia, and Kiribati.

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Sir very good content and very well organized too.

One correction sir – Susta area is in West Champaran(Bihar)

Note : (correct me please if i am wrong sir)


Sir, please provide the remaining notes of Geography optional


I think there is mistake ,it’s not McDonald line it’s a Mac Mohan line

Nikita Nagekar

Sir can I get the PDFs for the same..please.

Please guide me how can I contribute for this lovely efforts 😊

Last edited 2 years ago by Nikita Nagekar



Vy impressive… I fully understand


Thank you for such a perfect website! Everything is perfect however, there is a small correction that you/your team can make. The border with China is not updated. Laddakh took place of Jammu & Kashmir in sharing the border with China, and that too as an Union territory and not as an State.

Anup Chanda

Dear sir, I want to know this content enough or not for upsc exam?

Anup Chanda

Thank you so much sir for these very useful contents. 🙏🙏


thank you so much sir