Why this matters now
World physical features are tested through map-based Prelims questions (locating ranges, rivers, deserts, straits). A clear mental map pays off across geography and IR.
Continents and oceans
The world has seven continents (Asia, Africa, North America, South America, Antarctica, Europe, Australia) and five oceans (Pacific, Atlantic, Indian, Southern/Antarctic, Arctic). Asia is the largest continent and the Pacific the largest, deepest ocean.
Major mountain ranges
The great ranges include the Himalayas (Asia — highest, Mt Everest), the Andes (South America — longest continental range), the Rockies (North America), the Alps (Europe) and the Atlas (Africa). Most lie along plate boundaries.
Major rivers and deserts
Major rivers include the Nile (longest), the Amazon (largest by discharge), the Mississippi, Yangtze and Congo. Major deserts include the Sahara (largest hot desert), the Arabian, Gobi, Kalahari and Atacama (driest); the Antarctic is the largest desert overall (cold desert).
Other key features
Worth mapping: important straits (Malacca, Hormuz, Bab-el-Mandeb, Gibraltar), canals (Suez, Panama), major lakes (Caspian — largest; the African Rift lakes), and the Equator, Tropics and key latitudes/longitudes that organise the world map.
UPSC angle
Build a mental map: largest continent (Asia)/ocean (Pacific), longest range (Andes)/highest (Himalayas), longest river (Nile)/largest discharge (Amazon), largest hot desert (Sahara), and key straits/canals.
Frequently asked questions
How many continents and oceans are there?
Seven continents and five oceans (Pacific, Atlantic, Indian, Southern and Arctic).
Which is the longest mountain range?
The Andes in South America is the longest continental mountain range; the Himalayas are the highest.
Which is the largest desert in the world?
The Antarctic is the largest desert overall (a cold desert); the Sahara is the largest hot desert.
Which are important strategic straits to know?
The Malacca, Hormuz, Bab-el-Mandeb and Gibraltar straits, along with the Suez and Panama canals.