The Senegal River ; Wolof: Dexug Senegaal, Arabic: نهر السنغال, romanized: Nahr as-Siniġāl, Hassaniyya pronunciation: [nahrˤ əs.säjnigaːl], French: Fleuve Sénégal) is a 1086-kilometre-long (675 mi) river in West Africa; much of its length marks part of the border between Senegal and Mauritania. It has a drainage basin of 270000 km2, a mean flow of 680 m3/s (24,000 cu ft/s), and an annual discharge of 21.5 km3 (5.2 cu mi). Important tributaries are the Falémé River, Karakoro River, and the Gorgol River. The river divides into two branches once it passes Kaédi. The left branch, called the Doué, runs parallel to the main river to the north. After 200 km (120 mi) the two branches rejoin a few kilometers downstream of Podor.