English · हिन्दी · తెలుగు · தமிழ் · മലയാളം · मराठी · ಕನ್ನಡ
Quick recap: world physical geography on one page
All three parts condensed for quick revision: continents, peaks, mountains, plateaus and lowlands; rivers, lakes, deserts and grasslands; and seas, straits, canals, chokepoints and the Indian Ocean.
This chapter is the map behind many Prelims questions. Part 1 placed the land: the seven continents in order of area (Asia, Africa, North America, South America, Antarctica, Europe, Australia), the conventional boundaries between them (the Urals and the Caucasus, the Isthmus of Suez, the Isthmus of Panama, the Bering Strait), and the highest peak of each. Everest stands at 8,848.86 m, the height Nepal and China announced in 2020; K2 in the Karakoram is second, and Kangchenjunga, third, is the highest peak under Indian administration. Africa alone is crossed by the equator and both tropics, Antarctica is the highest and coldest continent, and Australia the smallest and flattest.
Mountains are sorted by how they formed. Young fold mountains rise where plates converge: the Himalaya, Alps, Rockies, Atlas and the Andes, the longest continental range; several Asian ranges radiate from the Pamir Knot. Old, worn-down ranges include the Appalachians, the Urals and India's Aravalli, among the oldest fold mountains on Earth. Block mountains and rift valleys come from faulting: the Rhine flows between the Vosges and the Black Forest, the East African Rift holds Lakes Tanganyika and Malawi, and the Narmada and Tapi run in rift valleys. Volcanic peaks such as Fuji, Kilimanjaro and Etna stand alone, most active volcanoes ring the Pacific, and plateaus range from Tibet and the Altiplano to the lava-built Deccan.
Part 2 followed the water. Some rivers never reach the sea: the Volga ends in the Caspian, the Amu Darya and Syr Darya in the Aral. The Yangtze is Asia's longest river and carries the Three Gorges Dam; the Mekong touches six countries and the Danube ten, more than any other river. The White and Blue Nile meet at Khartoum, the Congo crosses the equator twice, and the Amazon carries the most water and drains the largest basin. Among lakes, the Caspian is the largest but salty, Superior the largest freshwater lake by area, Baikal the deepest and oldest, and Titicaca a high navigable lake, while the Aral Sea and Lake Chad have shrunk dramatically.
A desert is defined by scarce rain, not by heat. Deserts form under the subtropical high-pressure belts (Sahara, Arabian, Thar, Kalahari), along western coasts chilled by cold currents (Atacama beside the Peru current, Namib beside the Benguela), in the rain-shadow area of mountains (Patagonia behind the Andes), and deep inside continents (Gobi, Taklamakan). Antarctica is the largest desert of all. Grasslands carry regional names: the tropical savanna of Africa, the Llanos of Venezuela and the Campos of Brazil; and the temperate Prairies of North America, Pampas of Argentina, Steppes of Eurasia, Veld of South Africa, Downs of Australia, Canterbury plains of New Zealand and Puszta of Hungary.
Part 3 moved to the sea. Each strait joins two seas: Hormuz the Persian Gulf and the Gulf of Oman, the Bab-el-Mandeb the Red Sea and the Gulf of Aden, Malacca the Andaman Sea and the South China Sea, Palk the Bay of Bengal and Palk Bay. The Suez Canal (1869) has no locks; the Panama Canal (1914) lifts ships to Gatun Lake; the Kiel Canal joins the North Sea and the Baltic. These narrow passages are chokepoints, as the Red Sea attacks from November 2023 and the Panama drought of 2023-24 showed. Around India, the Ten, Nine and Eight Degree Channels separate its island groups and the Maldives, and Indira Point is the country's southern tip.
| Topic | Must-know facts | Common trap |
|---|---|---|
| Continents | Asia, Africa, N America, S America, Antarctica, Europe, Australia | Antarctica is larger than Europe and Australia |
| Peaks | Everest 8,848.86 m (2020); K2 second; Kangchenjunga third | K2 is in the Karakoram, not the Himalaya |
| Mountains | Young fold: Andes longest; old: Appalachians, Urals, Aravalli | Kilimanjaro is a lone volcano, not a fold range |
| Rivers | Danube ten countries; Congo crosses the equator twice | The Volga ends in the Caspian, not the Black Sea |
| Lakes | Caspian largest; Superior largest freshwater by area; Baikal deepest | The Caspian is salty, so it is not the largest freshwater lake |
| Deserts | Subtropical highs, cold currents, rain shadow, distance from sea | Antarctica is the largest desert; Gobi is a cold desert |
| Straits | Hormuz, Bab-el-Mandeb, Malacca, Palk, Gibraltar, Bosporus | Malacca is Malay Peninsula and Sumatra, not Java |
| Canals | Suez 1869 (no locks); Panama 1914 (locks); Kiel 1895 | Panama, not Suez, uses locks and a lake |
Exam traps
- Only Africa is crossed by the equator and both tropics; Antarctica is larger than both Europe and Australia.
- K2 is the world's second highest peak and lies in the Karakoram; Kangchenjunga is the third highest and the highest under Indian administration.
- The Aravalli are far older than the Himalaya: low height does not mean young age.
- The Volga drains into the Caspian Sea; the Danube is the river that reaches the Black Sea, passing through or along ten countries.
- The Caspian is the largest lake but salty; Superior is the largest freshwater lake by area and Baikal the deepest.
- A desert is defined by low rainfall: Antarctica is the largest desert, and the Atacama and Namib are coastal deserts kept dry by cold currents.
- Hormuz joins the Persian Gulf to the Gulf of Oman; the Bab-el-Mandeb joins the Red Sea to the Gulf of Aden.
- The Suez Canal has no locks; the Panama Canal lifts ships to Gatun Lake. Ten Degree Channel: Andaman-Nicobar; Nine Degree: Lakshadweep-Minicoy.
Recap
- Continents by area: Asia, Africa, North America, South America, Antarctica, Europe, Australia.
- Peaks: Everest 8,848.86 m (2020), K2, Kangchenjunga; Aconcagua highest outside Asia.
- Mountains: young fold (Himalaya, Alps, Andes, Rockies, Atlas), old (Appalachians, Urals, Aravalli), block and rift (Rhine, East Africa, Narmada-Tapi), volcanic (Ring of Fire).
- Plateaus and lowlands: Tibet, Altiplano, Deccan; Great Plains, North European Plain, Amazon basin; Dead Sea shore the lowest land.
- Rivers: Yangtze, Mekong, Danube, Volga, Nile, Congo, Amazon, Mississippi-Missouri; inland drainage to the Caspian and Aral.
- Lakes: Caspian, Superior, Baikal, Victoria, Tanganyika, Titicaca; shrinking Aral and Chad.
- Deserts: four causes; hot, coastal and cold deserts; Antarctica the largest. Grasslands: savanna, Llanos, Campos; Prairies, Pampas, Steppes, Veld, Downs.
- Seas and straits: Hormuz, Bab-el-Mandeb, Malacca, Palk, Gibraltar, Bosporus and Dardanelles; canals Suez, Panama, Kiel; chokepoints and their disruptions.
Practice questions
Q1. Which one of the following continents is crossed by the equator, the Tropic of Cancer and the Tropic of Capricorn?
- South America
- Asia
- Africa
- Australia
Show answer
Answer: C. Africa
Only Africa is crossed by all three lines. South America is crossed by the equator and the Tropic of Capricorn but not the Tropic of Cancer; Asia by the equator (through Indonesia's islands) and the Tropic of Cancer but not Capricorn; Australia only by the Tropic of Capricorn.
Q2. Consider the following statements:
1. K2, the world's second highest peak, lies in the Karakoram.
2. The Aravalli are younger than the Himalaya.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer
Answer: A. 1 only
Statement 1 is correct. Statement 2 is wrong: the Aravalli are among the oldest fold mountains on Earth, far older than the young Himalaya. So '2 only' and 'Both' are wrong, and 'Neither' rejects a true statement.
Q3. Which of the following rivers end in an inland water body rather than the open sea?
1. Volga
2. Danube
3. Amu Darya
4. Rhine
Select the correct answer using the code given below:
- 1 and 3 only
- 1, 2 and 3 only
- 2 and 4 only
- 3 and 4 only
Show answer
Answer: A. 1 and 3 only
The Volga ends in the Caspian and the Amu Darya in the Aral, both inland. The Danube reaches the Black Sea and the Rhine the North Sea, both arms of the open ocean, so any option with 2 or 4 is wrong.
Q4. Which one of the following is the deepest lake in the world?
- Caspian Sea
- Lake Superior
- Lake Baikal
- Lake Victoria
Show answer
Answer: C. Lake Baikal
Lake Baikal in Siberia is the deepest and oldest lake. The Caspian is the largest by area, Superior the largest freshwater lake by area, and Victoria the largest lake in Africa; none of them is the deepest.
Q5. Consider the following pairs:
Grassland : Region
1. Pampas : Argentina
2. Veld : Australia
3. Steppes : Eurasia
Which of the pairs given above is/are correctly matched?
- 1 only
- 1 and 3 only
- 2 and 3 only
- 1, 2 and 3
Show answer
Answer: B. 1 and 3 only
Pairs 1 and 3 are correct. Pair 2 is wrong: the Veld is in South Africa, while Australia's temperate grasslands are the Downs. '1 only' misses pair 3, and the options with pair 2 are wrong.
Q6. The Atacama and the Namib deserts are dry mainly because:
- They lie in the rain shadow of high mountains
- Cold ocean currents flow along their coasts
- They lie far from any sea
- They lie on the equator
Show answer
Answer: B. Cold ocean currents flow along their coasts
Both are coastal deserts on western coasts, kept dry by the cold Peru and Benguela currents. Rain shadow explains Patagonia, distance from the sea explains the Gobi, and the equatorial belt is wet, not dry.
Q7. Match List I (Strait) with List II (Waters it joins):
List I: A. Hormuz B. Bab-el-Mandeb C. Malacca D. Palk
List II: 1. Red Sea and Gulf of Aden 2. Bay of Bengal and Palk Bay 3. Persian Gulf and Gulf of Oman 4. Andaman Sea and South China Sea
Select the correct code:
- A-1, B-3, C-4, D-2
- A-3, B-1, C-4, D-2
- A-3, B-1, C-2, D-4
- A-4, B-1, C-3, D-2
Show answer
Answer: B. A-3, B-1, C-4, D-2
Hormuz joins the Persian Gulf and the Gulf of Oman, the Bab-el-Mandeb the Red Sea and the Gulf of Aden, Malacca the Andaman Sea and the South China Sea, and Palk the Bay of Bengal and Palk Bay. The first option swaps Hormuz and Bab-el-Mandeb, the third swaps Malacca and Palk, and the fourth swaps Hormuz and Malacca.
Q8. Consider the following statements:
1. The Panama Canal uses locks to lift ships to Gatun Lake.
2. The Nine Degree Channel separates the Andaman Islands from the Nicobar Islands.
Which of the statements given above is/are correct?
- 1 only
- 2 only
- Both 1 and 2
- Neither 1 nor 2
Show answer
Answer: A. 1 only
Statement 1 is correct. Statement 2 is wrong: the Ten Degree Channel separates Andaman from Nicobar, while the Nine Degree Channel separates the main Lakshadweep group from Minicoy. So '2 only' and 'Both' are wrong, and 'Neither' rejects a true statement.
Study this in the Upscore app to keep notes, save it for revision, track your practice scores and follow a plan to the exam date. It's free.
Study this in the app →Sources
- United States Geological Survey: 'This Dynamic Earth: The Story of Plate Tectonics' (US government publication): fold mountains, rift valleys and plate boundaries — https://pubs.usgs.gov/publication/7000097
- NASA Earth Observatory: the continents, rivers, lakes (Caspian, Baikal, Aral Sea), and desert and grassland biomes (US government) — https://earthobservatory.nasa.gov
- USGS publication 'Deserts: Geology and Resources' and USGS Water Science School: causes of aridity, the major deserts, rivers and drainage basins (US government) — https://pubs.usgs.gov/gip/deserts/
- Survey of India: heights of Himalayan peaks, and maps of India, its island groups and the Palk Strait — https://surveyofindia.gov.in
- US Energy Information Administration, 'World Oil Transit Chokepoints'; Suez Canal Authority and Panama Canal Authority on the two canals — https://www.eia.gov/international/analysis/special-topics/World_Oil_Transit_Chokepoints