Extent of India and the standard meridian
The mainland of India stretches from 8°4′N to 37°6′N (latitude) and from 68°7′E to 97°25′E (longitude). So it spans about 30° each way. North to south it is about 3,214 km, and east to west about 2,933 km. The southernmost point of the country, Indira Point in the Nicobar Islands, is at about 6°45′N.
The Tropic of Cancer (23°30′N) passes through the middle of the country, dividing it into a tropical south and a subtropical north.
From east to west there is almost a 2-hour difference in sun time (30° × 4 minutes = 120 minutes). To keep one clock for the whole country, India uses 82°30′E, which passes near Mirzapur (Uttar Pradesh), as its standard meridian. Indian Standard Time (IST) is 5 hours 30 minutes ahead of Greenwich Mean Time (82.5 × 4 = 330 minutes).
Map tip: find the latitude and longitude lines first, then mark the feature. Always write the name neatly and add a key (legend).
Mountain ranges, peaks, passes, plateaus, coastal plains and islands
Ranges
Karakoram and the Himalayas (Greater, Lesser and Shiwalik) in the north; Garo, Khasi and Jaintia hills in the north-east; Aravalli (oldest fold mountains) in the north-west; Vindhya and Satpura across central India; Western Ghats (Sahyadri) along the west coast; Eastern Ghats in broken hills along the east.
Peaks
| Peak | Height (about) | Where |
|---|---|---|
| K2 (Godwin Austen) | 8,611 m | Karakoram |
| Kanchenjunga | 8,586 m | Eastern Himalaya (Sikkim) |
| Nanda Devi | 7,816 m | Kumaon Himalaya |
| Anai Mudi | 2,695 m | Anaimalai hills — highest in the peninsula |
| Doda Betta | 2,637 m | Nilgiri hills |
| Guru Shikhar | 1,722 m | Aravalli (Mount Abu) |
| Mahendragiri | 1,501 m | Eastern Ghats |
Passes
Karakoram Pass, Zoji La (Srinagar–Leh), Shipki La (Himachal, Sutlej valley), Nathu La (Sikkim), Bomdi La (Arunachal); in the Western Ghats: Thal Ghat and Bhor Ghat (roads and railways from Mumbai) and the Palghat gap (Kerala–Tamil Nadu).
Plateaus
Deccan Plateau (the big triangle south of the Narmada), Malwa Plateau, Chota Nagpur Plateau (rich in minerals) and Meghalaya (Shillong) Plateau.
Coastal plains
West (narrow): Kachchh and Kathiawar, Konkan, Kannad (Goa to Mangaluru) and Malabar. East (wider, with deltas): Northern Circars (north) and Coromandel (south).
Islands
Andaman and Nicobar Islands in the Bay of Bengal (Ten Degree Channel separates the two groups) and Lakshadweep in the Arabian Sea (coral islands; Eight and Nine Degree Channels nearby).
Rivers, lakes and gulfs
Rivers
- Himalayan: Indus (with Jhelum, Chenab, Ravi, Beas, Sutlej), Ganga (with Yamuna, Ghaghara, Gandak, Kosi, Son), Brahmaputra.
- Peninsular, flowing east (make deltas): Mahanadi, Godavari (largest peninsular river), Krishna, Kaveri.
- Peninsular, flowing west (make estuaries, flow through rift valleys): Narmada and Tapi.
Lakes
- Fresh water: Wular (one of Asia's largest fresh-water lakes) and Dal in Kashmir; Loktak in Manipur (floating islands called phumdis).
- Salt water: Sambhar in Rajasthan (salt making).
- Lagoons (coastal): Chilika in Odisha (largest brackish lagoon in India), Pulicat on the Andhra–Tamil Nadu coast, Vembanad in Kerala; Kolleru lies between the Godavari and Krishna deltas.
Gulfs and straits
Gulf of Kachchh and Gulf of Khambhat (Cambay) in the west; Gulf of Mannar and Palk Strait between India and Sri Lanka in the south-east.
Temperature and rainfall extremes
| Extreme | Place | Value (about) |
|---|---|---|
| Highest temperature | Phalodi and Barmer (Thar, Rajasthan) | 50–51 °C in May–June |
| Lowest temperature | Dras (Ladakh) | −45 °C in winter |
| Highest rainfall | Mawsynram and Cherrapunji/Sohra (Meghalaya) | about 1,100 cm a year |
| Lowest rainfall | Jaisalmer (west Rajasthan) and Leh (Ladakh) | under 15 cm (Leh about 10 cm) |
Why: the Thar is far from the sea with clear skies, so it heats most. Dras is high and far north. Mawsynram sits on funnel-shaped south-facing hills that catch the Bay of Bengal branch. Jaisalmer and Leh lie where the monsoon wind is weak or blocked.
Forest types on the map
- Tropical evergreen: western slopes of the Western Ghats, the north-east, Andaman and Nicobar.
- Moist deciduous: Jharkhand, Odisha, Chhattisgarh, north-east foothills, east of the Western Ghats.
- Dry deciduous: central India, Uttar Pradesh–Bihar plains, rainier parts of the Deccan.
- Thorn: Rajasthan, Kachchh, south-west Punjab and Haryana, dry Deccan.
- Montane: Himalayas; sholas in the Nilgiri, Anaimalai and Palani hills.
- Mangrove (littoral): Sundarbans, Mahanadi–Godavari–Krishna deltas, Andaman and Nicobar.
Map tip: shade each forest type in a different colour and give a key; do not draw state borders for this.
National parks and wildlife sanctuaries
| Park / sanctuary | Near / state | Known for |
|---|---|---|
| Jim Corbett | Uttarakhand | India's first national park (1936); tigers |
| Kaziranga | Assam, Brahmaputra flood plain | One-horned rhinoceros |
| Sundarbans | West Bengal delta | Tigers in mangroves |
| Gir | Gujarat (Kathiawar) | Only wild home of the Asiatic lion |
| Kanha | Madhya Pradesh | Tigers, barasingha deer |
| Ranthambore | Rajasthan | Tigers among old fort ruins |
| Keoladeo (Bharatpur) | Rajasthan | Winter migratory birds |
| Periyar | Kerala | Elephants around a lake |
| Bandipur | Karnataka (Nilgiri reserve) | Elephants, tigers |
| Silent Valley | Kerala | Untouched evergreen forest, lion-tailed macaque |
| Dachigam | Kashmir | Hangul (Kashmir stag) |
| Simlipal | Odisha | Tigers, waterfalls |
A national park gives the strictest protection; a wildlife sanctuary allows some activities like grazing or collecting produce with permission.
Key formulas and definitions
- Mainland extent: 8°4′N–37°6′N, 68°7′E–97°25′E (≈ 30° each way)
- Standard meridian of India = 82°30′E (near Mirzapur)
- Time difference = difference in longitude × 4 minutes
- IST = GMT + 5 h 30 min (82.5° × 4 min = 330 min)
- Tropic of Cancer = 23°30′N (passes through 8 states)
- Locate a feature: latitude line + longitude line + nearby clue (river, coast, range)
Worked examples
1. What is the local sun time difference between the eastern end (97°25′E) and western end (68°7′E) of India?
Difference in longitude ≈ 97.42 − 68.12 = 29.3°. Time = 29.3 × 4 ≈ 117 minutes, almost 2 hours.
2. When it is 12:00 noon IST, what is the local sun time at a place on 72°30′E (near Mumbai)?
Difference from 82°30′E = 10°. 10 × 4 = 40 minutes. The place is west, so the sun is later: local time ≈ 11:20 a.m.
3. How do you tell the Gulf of Kachchh from the Gulf of Khambhat on a map?
Both are on the Gujarat coast. The Gulf of Kachchh is to the north, above the Kathiawar peninsula (about 22.5°N). The Gulf of Khambhat is to the south-east of Kathiawar, near the mouths of the Narmada and Tapi (about 21.5°N).
4. You must mark Anai Mudi and Doda Betta. How do you avoid mixing them up?
Both are in the south near 10–11.5°N, 76–77°E. Anai Mudi (2,695 m) is further south in the Anaimalai hills in Kerala, near 10°N; Doda Betta (2,637 m) is north of the Palghat gap in the Nilgiris, near 11.4°N.
5. Why is Chilika called a lagoon and not a normal lake?
It is a shallow body of salty-fresh (brackish) water on the Odisha coast, cut off from the sea by a sandbar but joined to it by a narrow mouth. Such coastal water bodies are lagoons.
6. A place gets 1,100 cm of rain and another 10 cm. How many times more rain does the first get? Name both.
1,100 ÷ 10 = 110 times. The first is Mawsynram (Meghalaya); the second is Leh (Ladakh).
Common mistakes
- Taking Kanyakumari (8°4′N) as the southernmost point of the whole country. It is the mainland's tip; Indira Point (about 6°45′N) is the country's southernmost point.
- Writing the standard meridian as 82°E or placing it through Delhi. It is 82°30′E, passing near Mirzapur and Prayagraj.
- Marking Narmada and Tapi flowing east. They flow west into the Arabian Sea through rift valleys.
- Putting Chilika in Andhra Pradesh or Pulicat in Odisha. Chilika is in Odisha; Pulicat is on the Andhra–Tamil Nadu coast.