World Rivers and Mountains

One source for UPSC

Continent
Feature
Exam

GS Paper I · World geography

World Rivers and Mountains

One source for Prelims and GS-I. Ranges, peaks, rivers, comparison tables, a PYQ bank and a last-day sheet. No Indian drainage chapter beyond three Himalayan systems.

Syllabus anchor

Prelims. Indian and World Geography — Physical, Social, Economic Geography of India and the World.

Mains GS-I. Salient features of world’s physical geography.

Link every topic to plate tectonics and mountain building; fold, block, volcanic and residual mountains; alignment and rain shadow; earthquakes and volcanoes along fold belts; and a river’s source, course, mouth, basin and international character.

What Prelims asks

  • Countries a range passes through, as “how many of the above”.
  • Match range, continent, type and highest peak.
  • Source, direction and mouth — sea, ocean, or inland.
  • Odd one out, and pairs that look alike.
  • Map logic without a map: west coast of South America, rain shadow, north–south against east–west.

What Mains asks

  • Why fold systems lie on continental margins, and how that lines up with earthquakes and volcanoes. GS-I 2014.
  • Alignment of major ranges and the effect on local weather. GS-I 2021.
  • Standard examples: Andes, Himalayas, Alps, Atlas, Rockies.
  • The exam lens in the bar switches a card between the Prelims ask and the Mains use.

How to use this source

  1. Filter by continent. Read the trap on every card before the description.
  2. Peaks: sort by height, then the Seven Summits and the Europe trap.
  3. Rivers: source, direction, mouth. Ignore anything that is not one of those or the named trap.
  4. Tables: belts, rain shadow, inland drainage, in one sitting.
  5. PYQ bank, then only the traps you missed. The night before: Revise, the 15-minute sheet, then five map prompts.

Twenty facts

Heights and lengths are exam-safe textbook figures. Where a survey is more precise, the card shows both.

  1. Andes: about 7,000 km, the longest continental range, north–south. Seven countries from Venezuela to Argentina. Aconcagua, 6,961 m, is in Argentina and is not a volcano.
  2. The Rockies culminate at Mount Elbert, 4,401 m. Denali, 6,190 m, is in the Alaska Range. The active US volcanic arc is the Cascades, not the Rockies.
  3. Everest is 8,848.86 m, exam-safe rounded value 8,848 m, on the Nepal–China border. K2, 8,611 m, is in the Karakoram, not the Himalaya.
  4. Europe: Elbrus, 5,642 m, Caucasus, Russia, is the usual highest peak. Mont Blanc, 4,809 m, is the highest in the Alps. Elburz is a range in Iran.
  5. Damavand, 5,610 m, is the volcanic high point of the Elburz, south of the Caspian. The north slope is wet; Tehran is on the rain shadow.
  6. Alpine–Himalayan belt: collision, earthquakes, few volcanoes. Circum-Pacific belt: subduction, earthquakes and volcanoes together. The Andes belong to the second; the Himalayas to the first.
  7. Old fold and low: Urals, Appalachians, Scandinavian Mountains. Young fold and high: Andes, Alps, Himalayas, Atlas, Zagros, Caucasus.
  8. The Drakensberg is an escarpment, not a fold range. Its highest point, Thabana Ntlenyana, 3,482 m, is in Lesotho.
  9. Kosciuszko, 2,228 m, is the Bass-list summit of Australia. Puncak Jaya, 4,884 m, in Indonesian New Guinea, is the Messner-list summit of Oceania.
  10. Rain shadows to memorise: Himalayas–Tibet, Atlas–Sahara edge, subtropical Andes–Atacama. South of about 40°S the Andes flip: Patagonia, on the east, is the dry side.
  11. The Nile is the textbook longest river, about 6,650 km, and it flows north. Most of its water and silt come from the Blue Nile, not the White Nile.
  12. The Amazon has the greatest discharge, rises in the Peruvian Andes, flows east, and does not build a classic delta. Its basin straddles the equator; it does not cross the equator twice.
  13. The Congo crosses the equator twice, is the deepest river, and is second in discharge.
  14. The Volga is the longest river in Europe and ends in the Caspian. It does not reach the world ocean. The Danube, shorter, crosses ten countries and reaches the Black Sea.
  15. The Danube rises in the Black Forest, not the Alps, and cuts the Carpathians at the Iron Gates. Poland is not a Danube country.
  16. The Rhine and the Rhône rise close together in the Swiss Alps. The Rhine reaches the North Sea. The Rhône reaches the Mediterranean.
  17. The longer stem is often not the famous name: Missouri over the upper Mississippi, Irtysh over the upper Ob, Darling over the Murray. The Ohio, not the Missouri, supplies more water.
  18. Ob, Yenisei and Lena flow north to the Arctic. The Amur flows east to the Pacific and is the Russia–China border river. Baikal drains through the Angara to the Yenisei, not to the Lena.
  19. The Orinoco rises in the Guiana Highlands, not the Andes. The Casiquiare links it naturally to the Amazon.
  20. Outside India, the west-flowing traps are the Orange (Drakensberg to the Atlantic) and the Murray (Great Dividing Range, away from the Pacific). The Niger bends inland before its coastal delta.