World rivers
River systems
Source, direction, mouth. Lengths are exam-safe textbook figures. The Nile–Amazon length rank is disputed; discharge is not. Indus, Ganga and Brahmaputra appear only as Himalayan world systems.
- Nile6,650 kmAfrica · North. to Mediterranean Sea.Trap. It flows north. Length and volume are different questions. The Blue Nile, not the longer White Nile, is the flood.
- Amazon6,400 kmSouth America · East. to Atlantic Ocean.Trap. Do not give it a Mississippi-style bird-foot delta. Do not say it crosses the equator twice — that is the Congo.
- Congo4,700 kmAfrica · A great bend: north, west, then southwest. to Atlantic Ocean.Trap. Deepest and second in discharge, not the longest. The historical name Zaire is the same river.
- Niger4,200 kmAfrica · Northeast into the Sahara margin, then southeast. The great bend. to Gulf of Guinea, Atlantic.Trap. Two deltas, inland and coastal. Do not send it to the Mediterranean.
- Zambezi2,570 kmAfrica · East and southeast. to Indian Ocean.Trap. Indian Ocean, not the Atlantic. Not the Nile and not the Congo.
- Orange2,200 kmAfrica · West. to Atlantic Ocean.Trap. West-flowing. Atlantic, not the Indian Ocean. The source name in Lesotho is Senqu.
- Mississippi–Missouri6,275 kmNorth America · South. to Gulf of Mexico.Trap. Lake Itasca is the source of the Mississippi, not of the Missouri. The Missouri is the Rocky Mountain stem.
- Mackenzie4,240 kmNorth America · North. to Beaufort Sea, Arctic Ocean.Trap. North to the Arctic. The Peace is the long headwater; the name Mackenzie starts at Great Slave Lake.
- St Lawrence1,200 kmNorth America · Northeast. to Gulf of St Lawrence, Atlantic Ocean.Trap. It does not rise in the Rockies. Do not pair it with the Missouri.
- Colorado2,330 kmNorth America · Southwest. to Gulf of California (Sea of Cortez). The river now often fails to arrive.Trap. USA–Mexico, Gulf of California, often dry at the mouth. Not the Argentine Colorado.
- Rio Grande3,050 kmNorth America · Southeast. to Gulf of Mexico.Trap. Do not start it in the Mexican plateau. Conchos is the Mexican tributary that matters.
- Paraná–Paraguay4,880 kmSouth America · South. to Río de la Plata estuary, Atlantic Ocean.Trap. Iguazu is a tributary falls, not a falls of the Amazon. The mouth is an estuary.
- Orinoco2,140 kmSouth America · North, then east. to Atlantic Ocean.Trap. Source is the Guiana Highlands. Andean rivers join later. They are not the source.
- Yangtze6,300 kmAsia · East. to East China Sea.Trap. Longer than the Yellow River. Source is the Tibetan plateau, not the Himalaya and not the Indian side.
- Yellow River5,460 kmAsia · East, with the great Ordos loop to the north. to Bohai Sea.Trap. Do not award it the length title. That is the Yangtze. The sorrow is sediment and flood, not length.
- Mekong4,350 kmAsia · South. to South China Sea.Trap. India is not a Mekong country. The Irrawaddy is a different river, wholly in Myanmar.
- Irrawaddy2,170 kmAsia · South. to Andaman Sea.Trap. Not the Salween. The Salween also reaches Myanmar but is a gorge river born on the Tibetan plateau.
- Salween2,800 kmAsia · South. to Andaman Sea, Gulf of Martaban.Trap. The Irrawaddy is not one of the Three Parallel Rivers.
- Ob5,410 kmAsia · North. to Gulf of Ob, Kara Sea, Arctic Ocean.Trap. Same pattern as Missouri–Mississippi and Darling–Murray: the famous name is not the longest stem.
- Yenisei5,540 kmAsia · North. to Yenisei Gulf, Kara Sea, Arctic Ocean.Trap. Baikal does not drain to the Lena.
- Lena4,400 kmAsia · North. to Laptev Sea, Arctic Ocean.Trap. Not the outlet of Baikal. Not the Kara Sea — that is the Ob and the Yenisei.
- Amur4,444 kmAsia · East and southeast. to Tatar Strait, Sea of Okhotsk — Pacific drainage.Trap. Do not send the Amur to the Kara Sea. Heilongjiang is the Chinese name.
- Volga3,530 kmEurope · South. to Caspian Sea.Trap. Inland drainage. The Danube is shorter and does reach a sea that opens to the ocean. The Caspian is a lake.
- Danube2,850 kmEurope · East. to Black Sea.Trap. Poland is not a Danube country. The source is the Black Forest. Ten countries, not four.
- Rhine1,230 kmEurope · North, then northwest. to North Sea.Trap. Source in the Alps; mouth in the Netherlands, not in Germany. Do not swap it with the Danube.
- Murray–Darling3,672 kmOceania · The Murray flows west, then south. to Southern Ocean, through Lake Alexandrina. The mouth often has little or no outflow.Trap. Darling is the longer stem. The river does not flow east. Do not treat the mouth as a reliable outflow.
- Indus3,180 kmAsia · Himalayan world system · Northwest through the gorge, then south through Pakistan. to Arabian Sea.Trap. Do not start the Indus in India. The source is in China. This card is not an Indian tributary chapter.
- Ganga2,525 kmAsia · Himalayan world system · East, then southeast. to Bay of Bengal.Trap. The world’s largest delta is shared. It is not the Nile delta and not the Mississippi bird-foot.
- Brahmaputra2,900 kmAsia · Himalayan world system · East along Tibet, a great bend south, west across Assam, then south into Bangladesh. to Bay of Bengal, through the Meghna.Trap. It flows east for a long distance on the Tibetan side before entering India. It does not rise at Gangotri. It is not a tributary of the Indus.