📌 CDS Focus 2022–2026: World Geography tests straits and canals (which connects which seas — very direct questions), world rivers (longest = Nile; largest by discharge = Amazon), world deserts (Sahara = largest hot desert; Gobi = largest cold desert), and mountain ranges by continent. Questions are factual and matching-type. Focus on names, locations, and one key fact per feature.
1. World Physical Features — Mountains, Deserts, Rivers & Lakes
Fig. 1.1 — Major World Physical Features by Category
STRAITS, CANALS & PASSES
2. Important Straits & Canals of the World
Fig. 2.1 — Important Straits & Canals: What They Connect
COUNTRIES, CAPITALS & KEY FACTS
3. Important Countries & Their Capitals
Country
Capital
Key Geography / CDS Fact
Pakistan
Islamabad
Shares longest land boundary with India; Indus River; Thar Desert on border
China
Beijing
Largest land boundary with India (3,488 km); Tibetan Plateau; Yangtze & Yellow rivers
Bangladesh
Dhaka
Shares longest land border after China; Brahmaputra (as Jamuna); Sundarbans; Bengal delta
Island nation; Palk Strait separates from India; Adam's Bridge; tea producer
Myanmar
Naypyidaw
India's eastern neighbour; shares border with NE states; Irrawaddy River
Afghanistan
Kabul
Shares short border with India (PoK); Hindu Kush mountains; landlocked
Russia
Moscow
Largest country by area; Volga = longest European river; Lake Baikal (deepest)
USA
Washington D.C.
3rd largest by area; Mississippi River; Appalachian + Rocky Mountains; Great Lakes
Brazil
Brasília
Largest in S. America; Amazon River & rainforest; shares borders with all S. American countries except Chile & Ecuador
📐 Formula Sheet & Key Facts — GC14
World Rivers (Longest)
Nile: 6,650 km (longest overall) Amazon: 6,400 km (largest discharge) Yangtze: 6,300 km (Asia's longest) Mississippi: N. America longest
World Deserts
Largest hot: Sahara (N. Africa) Largest cold: Gobi (China/Mongolia) Driest: Atacama (Chile) S. Africa: Kalahari
World Lakes
Largest lake: Caspian Sea (saltwater) Largest freshwater: Superior Largest in Africa: Victoria (Nile source) Deepest lake: Baikal (Russia)
Straits & Canals
Malacca: Andaman Sea & S. China Sea Palk Strait: India & Sri Lanka Suez: Mediterranean & Red Sea Panama: Atlantic & Pacific
Mountain Ranges
Highest peak: Everest, Himalayas Andes: Longest; S. America Alps: Europe; Mont Blanc Urals: Europe–Asia boundary
Neighbouring Countries
Longest land border: Bangladesh (after China) Island nation: Sri Lanka & Maldives Landlocked neighbours: Nepal & Bhutan LoC border: Pakistan (Kashmir)
📝 Topic-Wise PYQs & Tricky Questions — GC14
Q1. The Strait of Malacca connects which two water bodies? CDS PYQ
(a) Indian Ocean and Pacific Ocean(b) Andaman Sea and South China Sea(c) Bay of Bengal and Java Sea(d) Arabian Sea and Indian Ocean
✔ Answer: (b) Andaman Sea and South China Sea
The Strait of Malacca lies between the Malay Peninsula (Malaysia) and the island of Sumatra (Indonesia), connecting the Andaman Sea (part of Indian Ocean) in the northwest to the South China Sea in the southeast. It is the world's busiest strait and the shortest sea route between Asia and Europe (via Suez Canal). About 80,000 vessels pass through annually, including 80% of China's oil imports.
Q2. Which is the world's longest river? ⚡ Tricky
(a) Amazon(b) Nile(c) Yangtze(d) Mississippi
✔ Answer: (b) Nile
The Nile (6,650 km) is generally accepted as the world's longest river, flowing through northeastern Africa (Uganda, Sudan, Egypt) into the Mediterranean Sea. The Amazon (6,400 km) is the world's largest river by water discharge and has the world's largest drainage basin. Common trap: Amazon is often thought to be longest but is actually the mightiest. This distinction (longest = Nile; largest discharge = Amazon) is a direct CDS question.
Q3. The Suez Canal connects which two water bodies, avoiding the need to sail around Africa? CDS PYQ
(a) Black Sea and Red Sea(b) Mediterranean Sea and Red Sea(c) Arabian Sea and Mediterranean Sea(d) Atlantic Ocean and Indian Ocean
✔ Answer: (b) Mediterranean Sea and Red Sea
The Suez Canal (Egypt) connects the Mediterranean Sea (north) to the Red Sea (south), enabling ships to travel between Europe and Asia without sailing around Africa — saving approximately 7,000 km. It is a sea-level canal (no locks needed), unlike the Panama Canal. Opened in 1869. Nationalised by Egypt in 1956 (Suez Crisis). About 12–15% of global trade passes through it.
Q4. The Palk Strait separates India from which country? CDS PYQ
(a) Maldives(b) Bangladesh(c) Sri Lanka(d) Myanmar
✔ Answer: (c) Sri Lanka
The Palk Strait separates Tamil Nadu (India) from the Northern Province of Sri Lanka. It connects the Bay of Bengal (northeast) with the Gulf of Mannar (southwest). Adam's Bridge (Ram Setu) — a natural chain of limestone shoals — lies across this strait between Rameswaram (India) and Mannar Island (Sri Lanka). The strait is shallow (1–10 m) and about 53–80 km wide.
Q5. The Gobi Desert, world's largest cold desert, is located in: CDS PYQ
(a) Central Asia — China and Mongolia(b) Russia(c) South America(d) North Africa
✔ Answer: (a) Central Asia — China and Mongolia
The Gobi Desert spans northern China and southern Mongolia, making it the world's largest cold desert (~1.3 million km²). "Cold desert" means it receives little precipitation and has extreme temperature variations. The Sahara (N. Africa) is the world's largest hot desert (~9.2 million km²) — also the world's largest desert overall. The Atacama (Chile, S. America) is the world's driest desert. The Thar is India's largest desert.
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