Nile

The Nile river, which runs for 4,258 miles through eleven countries, is widely regarded as the world's longest river. It is Sudan's main supply of water. Its two main tributaries, the Blue and White Niles merge in Khartoum and run north to Lake Nubia, also known as Lake Nasser on the Egyptian side of the border. The White Nile, which originates in central Africa and flows 2,299 miles through five nations before reaching Sudan, is significantly longer. The Blue Nile starts in Ethiopia and runs for 901 kilometers before merging with the White Nile. The Nile's tributaries include the 500-mile Atbarah, 398-mile Barka, 300-mile Dinder, and 137-mile Angareb rivers.

The Nile travels across Sudan in a unique route. Between Aswan and Sabaloka, it passes through six groups of cataracts before turning south and heading north toward Egypt. As it reaches the Sudanese border, the river enters Lake Nubia, also known as Lake Nasser in Egypt.

Length: 4,258 miles (shared with 10 other countries)