Political & Physical Divisions of World & India – Quick Revision Notes
Over 1,200 words featuring bullet points, tables, mnemonics, and key highlights for efficient study.
This guide provides a structured, quick-reference overview of the world’s and India’s major physical and political divisions. Use the tables, mnemonics, and key points for effective last-minute revision.
1. World – Physical Divisions
1.1 Continents & Major Landforms
| Continent |
Area (million km²) |
Highest Point |
Longest River |
Major Desert |
Notable Feature |
| Asia |
44.58 |
Mt. Everest (8,848 m) |
Yangtze (6,300 km) |
Gobi, Taklamakan |
Largest & most populous continent |
| Africa |
30.37 |
Mt. Kilimanjaro (5,895 m) |
Nile (6,650 km) |
Sahara (largest hot desert) |
Great Rift Valley |
| North America |
24.71 |
Denali (6,190 m) |
Mississippi‑Missouri (6,275 km) |
Sonoran, Chihuahuan |
Great Lakes, Rocky Mountains |
| South America |
17.84 |
Aconcagua (6,961 m) |
Amazon (≈7,000 km) |
Atacama (driest) |
Amazon Rainforest, Andes |
| Antarctica |
14.00 (ice‑covered) |
Vinson Massif (4,892 m) |
– (no permanent rivers) |
– (polar desert) |
Largest ice sheet, 98% ice cover |
| Europe |
10.18 |
Mt. Elbrus (5,642 m) |
Volga (3,690 km) |
– (limited) |
Highly indented coastline, Alps |
| Oceania |
8.60 |
Mt. Wilhelm (4,509 m) |
Murray‑Darling (2,508 km) |
Great Victoria, Simpson |
Great Barrier Reef |
Mnemonic for the 7 Continents (alphabetical order):
Eat An Apple As A Night Owl → Europe, Asia, Africa, Antarctica, Australia, North America, Oceania.
1.2 Major Mountain Systems
- Himalayas (Asia): Young fold mountains; source of major rivers (Indus, Ganges, Brahmaputra).
- Andes (South America): Longest continental mountain range; volcanic activity.
- Rockies (North America): Part of the North American Cordillera; rich in minerals.
- Alps (Europe): Famous for tourism, glaciers, and hydro‑power.
- Atlas (North‑west Africa): Acts as a climatic barrier.
- Great Dividing Range (Australia): Influences rainfall pattern on the east coast.
1.3 Major River Systems (World)
- Nile (Africa): Longest river; flows northward into the Mediterranean.
- Amazon (South America): Largest discharge; basin covers ~7 million km².
- Yangtze (Asia): Longest in Asia; vital for China’s economy.
- Mississippi‑Missouri (North America): Core of US inland navigation.
- Congo (Africa): Second‑largest discharge; crosses the equator twice.
2. World – Political Divisions
2.1 Number of Countries per Continent (2024)
| Continent |
Sovereign States |
Notable Groupings |
| Africa |
54 |
African Union (AU) |
| Asia |
49 |
ASEAN, SAARC, GCC |
| Europe |
44 |
European Union (EU), NATO |
| North America |
23 |
USMCA, CARICOM |
| South America |
12 |
Mercosur, Pacific Alliance |
| Oceania |
14 |
Pacific Islands Forum |
2.2 Key Geopolitical Blocs
- European Union (EU): 27 member states; single market.
- USMCA: Trade bloc of USA, Canada, Mexico.
- ASEAN: 10 Southeast Asian nations for economic integration.
- BRICS: Emerging economies: Brazil, Russia, India, China, South Africa.
3. India – Physical Divisions
3.1 Six Major Physiographic Regions
| Region |
Location |
Main Features |
Economic Importance |
| Northern Mountains |
Himalayas & Karakoram |
Young fold mountains; glaciers; biodiversity hotspot |
Hydropower, tourism, defence |
| Indo‑Gangetic Plain |
Punjab to Assam |
Alluvial deposits; flat, fertile |
Intensive agriculture; high population density |
| Peninsular Plateau |
Central & South India |
Ancient crystalline rocks; Deccan Traps; Ghats |
Mineral wealth, cotton, horticulture |
| Coastal Plains |
Western & Eastern coasts |
Narrow strips; lagoons, estuaries |
Fishing, port‑based trade, spices |
| Indian Desert (Thar) |
Rajasthan, Gujarat |
Arid sandy plains; saline lakes |
Livestock, wind‑energy, minerals |
| Islands |
Andaman & Nicobar, Lakshadweep |
Coral atolls, volcanic islands |
Strategic naval base, tourism, fisheries |
Mnemonic: Northern Mountains, Indo‑Gangetic Plain, Peninsular Plateau, Coastal Plains, Islands, Desert → N I P P I D.
3.2 Major River Systems (India)
| River |
Origin |
Length (km) |
Key Significance |
| Ganga |
Gangotri Glacier |
2,525 |
Agriculture, religious significance, navigation |
| Godavari |
Trimbak, Maharashtra |
1,465 |
“Dakshin Ganga”; irrigation |
| Brahmaputra |
Tibet |
2,900 (total) |
Flood‑plain agriculture, tea, hydro‑power |
| Narmada |
Amarkantak |
1,312 |
Largest west‑flowing river; dam projects |
4. India – Political Divisions
4.1 States & Union Territories (2024)
- States: 28 (e.g., Uttar Pradesh, Maharashtra, Tamil Nadu).
- Union Territories (UTs): 8 (e.g., Delhi, Chandigarh, Ladakh, Puducherry).
Mnemonic for 8 UTs: Andaman, Chandigarh, Dadra & Nagar Haveli & Daman & Diu, Delhi, Jammu & Kashmir, Lakshadweep, Ladakh, Puducherry → A C D D J L L P.
4.2 International Borders of India
| Neighbour |
Border Length (km) |
Key States/UTs |
| Bangladesh |
4,096 |
West Bengal, Assam, Meghalaya, Tripura, Mizoram |
| China |
3,488 (LAC) |
Ladakh, Himachal, Uttarakhand, Sikkim, Arunachal |
| Pakistan |
3,323 |
Jammu & Kashmir, Ladakh, Punjab, Rajasthan, Gujarat |
| Nepal |
1,751 |
Uttarakhand, UP, Bihar, West Bengal, Sikkim |
Mnemonic for Neighbours (clockwise from NW): Pakistan, China, Nepal, Bhutan, Bangladesh, Myanmar → P C N B B M.
5. Quick-Reference Tables
5.1 World – Largest by Category
| Category |
First |
Second |
Third |
| Continent (Area) |
Asia |
Africa |
North America |
| Country (Area) |
Russia |
Canada |
USA |
| River (Length) |
Nile |
Amazon |
Yangtze |
| Ocean (Area) |
Pacific |
Atlantic |
Indian |
5.2 India – Largest by Category
| Category |
First |
Second |
Third |
| State (Area) |
Rajasthan |
Madhya Pradesh |
Maharashtra |
| State (Population) |
Uttar Pradesh |
Maharashtra |
Bihar |
| River (Length in India) |
Ganga |
Godavari |
Krishna |
How to Use These Notes
- Skim the tables first to get the “big picture” (largest, longest, highest).
- Recall the mnemonics aloud – they act as quick triggers for
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