NDA Geography · Free notes
Indian Geography — Physical Features — NDA Geography
This is one of the two biggest chapters in NDA Geography — 69 PYQs across 2017–2026 — and it is pure named-fact recall: which peak, which river, which pass, which soil, which state. There is almost no process to trace here; the marks go to whoever has memorised the map of India cleanly. So the chapter is built as a set of organised lookup tables rather than long explanations, and it teaches in the order a student should walk the country: (1) Location, extent and frontiers of India — where India sits, its east-west sunrise gap, coastline and land neighbours; (2) Mountains, plateaus and plains of India — the physiographic divisions, Himalayan ranges and passes, the Peninsular Plateau, the alluvial belts of the plains; (3) Indian rivers, lakes and water bodies — the Himalayan vs Peninsular river systems, tributaries, lakes, river features and waterways; (4) Indian soils and climate-agriculture — the soil types and their crops, the monsoon and its quirks; (5) Forests and natural vegetation of India — vegetation belts, forest cover, biosphere reserves and protected areas; (6) Indian states and islands — borders, state facts, islands and coral reefs. Most questions are EASY/MODERATE; the HARD ones are the match-the-list and arrange-in-order items. Drill the tables, win the marks.
The handout has every subtopic, worked example, formula and trap with answers shown. The formula sheet is the chapter’s formulas and traps alone, on one page.
Subtopic notes
Location, Extent and Frontiers of India
5 PYQsIndia stretches about 30 degrees of longitude east to west — enough for a two-hour gap in sunrise — and 30 degrees of latitude north to south, with a long coastline and land frontiers shared with seven neighbours.
Mountains, Plateaus and Plains of India
7 PYQsIndia is built of four great physiographic divisions — the young folded Himalayas in the north, the flat alluvial Northern Plains, the old rigid Peninsular Plateau fringed by the Ghats, and the narrow Coastal Plains by the sea.
Indian Rivers, Lakes and Water Bodies
27 PYQsIndia's drainage splits into the snow-fed, perennial Himalayan rivers (Indus, Ganga, Brahmaputra systems) and the rain-fed Peninsular rivers (Godavari, Krishna, Narmada, Tapti), with a scatter of famous lakes and a growing inland-waterway network.
Indian Soils and Climate-Agriculture
10 PYQsIndia's soils — alluvial, black (regur), red, laterite, desert — each suit particular crops, and the monsoon's timing, variability and regional swings govern when and where those crops grow.
Forests and Natural Vegetation of India
15 PYQsIndia's natural vegetation runs from tropical deciduous forests (the largest belt) to thorn, montane, Shola and evergreen types, with forest-cover rankings and protected areas (tiger and biosphere reserves) layered on top.
Indian States and Islands
5 PYQsIndia's states differ in size, borders and economy, and its island groups — the Andaman & Nicobar in the Bay of Bengal and Lakshadweep in the Arabian Sea — carry their own distinct geography and coral reefs.
Formula & revision sheet
0 formulas · 15 reference tables · 14 gotchas across all subtopics — the exam-eve cheat-sheet
Formula & revision sheet
0 formulas · 15 reference tables · 14 gotchas across all subtopics — the exam-eve cheat-sheet
Reference tables (1)
Coastline and land frontiers3 rows
| Question | Answer |
|---|---|
| Longest coastline among Odisha/TN/Karnataka/WB | Tamil NaduQ NDA 2017 — among the listed states; Gujarat is longest overall but was not an option. |
| NE state that does NOT border 2+ countries | Tripura (only Bangladesh)Q NDA 2020 — Tripura touches just one country; Arunachal/Mizoram touch two or more. |
| Number of land neighbours of India | Seven |
Watch out for (2)
- Order sunrise lists EAST first→ India's location, extent and the sunrise gap
- Coastline answer is option-bound→ Coastline and land frontiers
Reference tables (3)
The alluvial belts of the Northern Plains4 rows
| Belt | What it is |
|---|---|
| Bhabar | Porous boulder/gravel belt below the Shiwaliks; rivers go undergroundQ NDA 2023 — the belt where rivers deposit rocks and boulders is the Bhabar. |
| Tarai | Marshy, re-emergent belt south of the Bhabar |
| Bhangar | Old, higher alluvium |
| Khadar | New floodplain alluvium (most fertile) |
The Peninsular Plateau and the Ghats3 rows
| Feature | Fact |
|---|---|
| Mahendragiri | Highest peak of the Eastern Ghats — in OdishaQ NDA 2025 — Mahendragiri is in Odisha. |
| Nilgiri Hills | Where the Eastern and Western Ghats meet (southern point of the plateau)Q NDA 2023 — statement 1 (Ghats meet at the Nilgiris) is correct; the Cardamom Hills are NOT an Eastern-Ghats continuation. |
| Cardamom Hills | Southern continuation of the WESTERN Ghats |
Watch out for (3)
- Match the pass to the right range AND state→ Himalayan passes and their ranges/states
- Bhabar vs Tarai→ The alluvial belts of the Northern Plains
- Cardamom Hills are WESTERN, not Eastern→ The Peninsular Plateau and the Ghats
Reference tables (3)
Rivers and their tributaries4 rows
| River | Tributaries | Watch-out |
|---|---|---|
| Kaveri | Hemavati, Kabini, Arkavati, Amravati | Indravati is NOT a Kaveri tributary (it is Godavari's) Indravati is the impostor in a Kaveri-tributary list. |
| Godavari | Indravati, Manjra, Penganga | Penganga is Godavari's, NOT Ganga's |
| Krishna | Bhima, Tungabhadra | — |
| Brahmaputra | Manas, Kameng, Subansiri | Mahananda is NOT a tributaryQ NDA 2021 — Mahananda is the odd one out in a Brahmaputra-tributary list. |
Alternative names, confluences, dams and river islands5 rows
| Feature | Answer |
|---|---|
| Sarda's name before the plains | KaliQ NDA 2019 — the Sarda is the Kali in the hills. |
| Rudraprayag confluence | Alaknanda + MandakiniQ NDA 2017 — Rudraprayag is where the Mandakini meets the Alaknanda. |
| River island Majuli | On the BrahmaputraQ NDA 2018 — Majuli is on the Brahmaputra. |
| Krishna Raja Sagara dam | On the KaveriQ NDA 2020 — KRS is on the Kavery. |
| Garhwal basin towns | Bhagirathi-Uttarkashi, Alaknanda-Pauri, Nayar-Lansdowne, Ganga-Narendra NagarQ NDA 2018 — match the Garhwal town to its river basin. |
Watch out for (2)
- The Ganga is the odd one out→ Himalayan vs Peninsular river systems and their origins
- Penganga ≠ Ganga; Indravati ≠ Kaveri→ Rivers and their tributaries
Reference tables (2)
Indian soils and the crops they suit3 rows
| Soil | Key fact / crop |
|---|---|
| Black soil (Regur) | Cotton soil; moisture-retentive, lime-rich, clayeyQ NDA 2023 — regur is the ideal cotton soil; NDA 2024 — 'less clay factor' is the FALSE statement about black soil. |
| Laterite soil | Holds appreciable calcium among the listed nutrientsQ NDA 2024 — calcium is the answer for laterite (it is poor in N, P and potash). |
| Alluvial soil | Fertile soil of the plains and deltas |
Köppen climate types of India4 rows
| Climate code | Region |
|---|---|
| Amw (short dry season) | Kerala & Karnataka coastQ NDA 2017 — climate-type ↔ state match-list. |
| Dfc (cold humid winter) | Arunachal Pradesh |
| Cwg (dry winter) | Uttar Pradesh & Bihar |
| As (dry summer) | Tamil Nadu coast |
Watch out for (2)
- Black soil has MORE clay, not less→ Indian soils and the crops they suit
- The monsoon is NOT punctual→ The Indian monsoon and its climate quirks
Reference tables (4)
Natural vegetation belts and tree species4 rows
| Vegetation cue | Region / answer |
|---|---|
| Largest-area vegetation | Tropical deciduous forestQ NDA 2021 — tropical deciduous (monsoon) forest covers the most area. |
| Khair, Neem, Khejri, Palas | Desert regionQ NDA 2022 — these dry-thorn trees indicate the Desert region. |
| Shola (temperate S. India) | Anaimalai, Nilgiris, Palani hillsQ NDA 2025 — Sholas occur in all three: Anaimalai, Nilgiris, Palani. |
| Himalayan trees | Oak + Rhododendron (NOT Rosewood)Q |
Forest cover rankings (India State of Forest Report)3 rows
| Ranking | Answer |
|---|---|
| Largest forest cover by AREA (older) | Madhya PradeshQ NDA 2017 — by area, the largest forest cover is Madhya Pradesh. |
| Largest forest cover by AREA (ISFR 2021) | Arunachal PradeshQ NDA 2022 — per the 2021 report, Arunachal Pradesh (among the listed states). |
| Highest forest % among Himalayan states | Arunachal PradeshQ NDA 2025 — highest percentage of geographical area under forest. |
Tiger reserves, biosphere reserves and sanctuaries3 rows
| Item | Answer |
|---|---|
| Largest tiger reserve (core habitat) | Nagarjunasagar–SrisailamQ NDA 2018 — largest by core/critical tiger habitat area. |
| World Network Biosphere Reserves | Gulf of Mannar, Nokrek, Panchmarhi, SimlipalQ NDA 2017 — the set included in UNESCO's World Network. |
| Sanctuaries south→north | Bhadra → Simlipal → Pachmarhi → Shikari DeviQ |
Watch out for (2)
- Rosewood is NOT Himalayan→ Natural vegetation belts and tree species
- By AREA vs by PERCENTAGE→ Forest cover rankings (India State of Forest Report)
Reference tables (2)
State borders, size and economy facts3 rows
| Fact | Value |
|---|---|
| Assam's borders | 2 countries (Bhutan, Bangladesh), 7 Indian statesQ NDA 2025 NDA-2 keyed this as '3 countries, 7 states' (option C). Geographically Assam borders only 2 countries — it does NOT touch China (that is Arunachal). Treat the official answer as a paper quirk; the correct count is 2. |
| FALSE statement trap | 'MP is the 4th largest state' is wrongQ NDA 2023 — Madhya Pradesh is NOT the fourth largest by area (it is the second). |
| Hornbill festival | Nagaland |
Andaman & Nicobar, Lakshadweep and coral reefs3 rows
| Fact | Detail |
|---|---|
| Major coral-reef areas | Gulf of Kachchh, Gulf of Mannar, Lakshadweep, A&N IslandsQ NDA 2017 — all four (1, 2, 3 and 4) are major coral-reef areas. |
| A&N false-statement trap | 'Max rainfall March–April' is WRONGQ NDA 2024 — A&N rainfall is monsoon-driven, NOT March–April. |
| 10° Channel | Separates Andaman from Nicobar (~150 km) |
Watch out for (3)
- Madhya Pradesh is SECOND, not fourth, largest→ State borders, size and economy facts
- Assam borders 2 countries, not 3→ State borders, size and economy facts
- A&N rainfall is monsoon-driven, not March–April→ Andaman & Nicobar, Lakshadweep and coral reefs
PYQ weightage by concept
23 concepts · 69 PYQs — where the marks actually sit, so you know what to drill first
PYQ weightage by concept
23 concepts · 69 PYQs — where the marks actually sit, so you know what to drill first
| Concept | PYQs | Share |
|---|---|---|
| India's location, extent and the sunrise gap | 3 | 4% |
| Coastline and land frontiers | 2 | 3% |
| Concept | PYQs | Share |
|---|---|---|
| Himalayan passes and their ranges/states | 2 | 3% |
| The Peninsular Plateau and the Ghats | 2 | 3% |
| The four physiographic divisions | 1 | 1% |
| The Himalayan ranges, north to south | 1 | 1% |
| The alluvial belts of the Northern Plains | 1 | 1% |
| Concept | PYQs | Share |
|---|---|---|
| The Indus system and its rivers | 5 | 7% |
| Alternative names, confluences, dams and river islands | 5 | 7% |
| Himalayan vs Peninsular river systems and their origins | 4 | 6% |
| Rivers and their tributaries | 4 | 6% |
| River basins, drainage patterns and inland waterways | 4 | 6% |
| Famous lakes of India and their states | 3 | 4% |
| East-flowing vs west-flowing peninsular rivers | 2 | 3% |
| Concept | PYQs | Share |
|---|---|---|
| The Indian monsoon and its climate quirks | 6 | 9% |
| Indian soils and the crops they suit | 3 | 4% |
| Köppen climate types of India | 1 | 1% |
| Concept | PYQs | Share |
|---|---|---|
| Natural vegetation belts and tree species | 6 | 9% |
| Forest cover rankings (India State of Forest Report) | 4 | 6% |
| Tiger reserves, biosphere reserves and sanctuaries | 3 | 4% |
| World grasslands and forest-fire current affairs | 2 | 3% |
| Concept | PYQs | Share |
|---|---|---|
| State borders, size and economy facts | 3 | 4% |
| Andaman & Nicobar, Lakshadweep and coral reefs | 2 | 3% |
Test yourself on Indian Geography — Physical Features
20 past NDA questions from this chapter, timed at 20 minutes and marked the way the exam marks it. You see your score and every answer the moment you finish. Free to start.