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World Geography: Notes for UPSC, SSC & Railway Exams

World physical geography (oceans, lakes, deserts, grasslands, straits, canals) and economic geography (mining and industrial regions) in one sheet.

60-second revision

  • Pacific: largest and deepest ocean; Challenger Deep in the Mariana Trench is about 11 km deep.
  • Largest island: Greenland; largest lake: Caspian Sea; deepest lake: Baikal (Russia).
  • Grasslands: Prairies, Pampas, Steppes, Veld, Downs (temperate); Savanna, Llanos, Campos (tropical).
  • Hormuz: Persian Gulf–Gulf of Oman; Bab-el-Mandeb: Red Sea–Gulf of Aden; Malacca: Malay Peninsula–Sumatra.
  • Suez: Mediterranean–Red Sea (1869); Panama: Atlantic–Pacific (1914).
  • Coastal deserts sit beside cold currents: Atacama (Humboldt), Namib (Benguela).
  • Chile leads in copper; the Ruhr (Germany) is a coal–steel region.

Continents and oceans

There are seven continents — Asia (largest), Africa, North America, South America, Antarctica, Europe and Australia (smallest) — and five oceans: Pacific (largest and deepest), Atlantic, Indian, Southern and Arctic (smallest). The Atlantic is S-shaped and the busiest ocean for trade; the Indian Ocean is the only ocean named after a country.

SuperlativeAnswer
Highest mountainMount Everest, Nepal–China border (8,848.86 m, as jointly announced in 2020)
Longest mountain range on landAndes, South America
Deepest pointChallenger Deep, Mariana Trench, Pacific (about 11 km)
Largest islandGreenland
Largest lake (by area)Caspian Sea
Largest freshwater lake (by area)Lake Superior, North America
Deepest lakeLake Baikal, Russia
Largest hot desertSahara, Africa
River with the largest dischargeAmazon
Largest coral reef systemGreat Barrier Reef, off Queensland, Australia

Grasslands of the world

TypeNameRegion
TemperatePrairiesNorth America
TemperatePampasArgentina
TemperateSteppesEurasia (Ukraine to Central Asia)
TemperateVeldSouth Africa
TemperateDownsAustralia
TemperateCanterburyNew Zealand
TropicalSavannaAfrica
TropicalLlanosVenezuela and Colombia
TropicalCamposBrazil

Deserts

  • Hot deserts lie mostly between 15 and 30 degrees latitude on the western sides of continents, under subtropical high pressure: Sahara, Arabian, Thar, Kalahari, Great Australian, Mojave.
  • Coastal deserts form beside cold currents that cool the air and stop rain: Atacama (Chile, Humboldt Current), Namib (Namibia, Benguela Current).
  • Cold or rain-shadow deserts: Gobi (Mongolia–China), Patagonia (Argentina), Ladakh.

Straits and canals

Strait / canalConnects or separates
Strait of GibraltarMediterranean Sea and Atlantic; Spain (Europe) and Morocco (Africa)
Strait of HormuzPersian Gulf and Gulf of Oman; Iran and Oman
Bab-el-MandebRed Sea and Gulf of Aden; Yemen and Djibouti
Strait of MalaccaAndaman Sea and South China Sea; Malay Peninsula and Sumatra
Palk StraitIndia and Sri Lanka
Bering StraitAsia (Russia) and North America (Alaska)
Strait of DoverEngland and France
BosporusBlack Sea and Sea of Marmara; divides Istanbul
Suez Canal (1869)Mediterranean Sea and Red Sea, in Egypt
Panama Canal (1914)Atlantic and Pacific Oceans, across the isthmus of Panama

Latitudes that cross many countries

The equator passes through South America (Ecuador, Colombia, Brazil), Africa (Gabon, Republic of the Congo, DR Congo, Uganda, Kenya, Somalia, plus Sao Tome and Principe) and Asia (Maldives' waters, Indonesia), as well as Pacific island nations like Kiribati. Africa is the only continent crossed by the equator, the Tropic of Cancer and the Tropic of Capricorn.

Economic geography

Resource / regionWhere
CopperChile (Chuquicamata, Escondida) and Peru in the Andes; the Copperbelt of Zambia and DR Congo
Iron oreMesabi Range (USA), Pilbara (Western Australia), Carajas (Brazil)
PetroleumPersian Gulf region, Russia, the USA, Venezuela, Nigeria
RuhrCoal, iron and steel region of Germany along the Rhine
PittsburghHistoric steel city of the USA
DetroitMotor city — automobiles, USA
Silicon ValleyCalifornia — information technology
OsakaTextile centre, called the 'Manchester of Japan'

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