The World's Longest River: The Nile

There is no single "main river" globally, but the longest river in the world is the Nile River in Africa.

Nile Vital Statistics

• Length: ~6,650 km (4,132 mi) – measured from Kagera River headwaters (Burundi/Rwanda) to Mediterranean delta.
• Basin: 3.4M km² (11 countries: Tanzania, Uganda, Rwanda, Burundi, DRC, Kenya, Ethiopia, Eritrea, South Sudan, Sudan, Egypt).
• Key tributaries: White Nile (Lake Victoria → Sudd → Khartoum), Blue Nile (Lake Tana, Ethiopia → Khartoum – 60%+ of water).
• Flow: ~2,830 m³/s (at Aswan, pre-dam). Highly seasonal.

Runner-Up

Amazon (South America): ~6,400 km (by some measures longer if Pará estuary counted). Largest by discharge (209,000 m³/s).

Why It Matters

• Egypt/Sudan: 95%+ water dependence.
• GERD (Grand Ethiopian Renaissance Dam) – geopolitical flashpoint.
• Ancient civilization cradle (Kerma, Kush, Egypt).
• Biodiversity: Nile perch, crocodile, hippo, migratory birds.

Other "main" rivers by context: Mississippi (US), Yangtze (China), Danube (Europe), Murray-Darling (Australia), Mackenzie (Canada). But Nile = global length champion.