|Bahr Sarh; Bahr Sara|
|Countries||Chad, Central African Republic|
|- left||Nana Barya|
|- elevation||1,139 m (3,737 ft)|
|- location||Chari River north from Sarh, Chad|
|- elevation||364 m (1,194 ft)|
|Length||676 km (420 mi)|
|Basin||70,000 km2 (27,027 sq mi)|
|- average||480 m3/s (16,951 cu ft/s)|
The Ouham River is a river in Central Africa, and one of the main headwaters of the Chari River. The Ouham originates in the Central African Republic between the prefecture Nana-Mambéré and the prefecture Ouham-Pendé, crossing into Chad where it joins the Chari about 25 km north Sarh. Tributaries are Baba, Fafa, Nana Bakassa, Nana Barya.
The flow of the river observed over 33 years (1951–84) in Moïssala a town in Chad about 150 km above the mouth of the Chari. The at Moïssala observed average annual flow during this period was 480 m³ / s fed by an area of about 67,600 km ² approximately 95% of the total catchment area of the River.
The average monthly flow of the river Sara at hydrological station of Moïssala (in m³ / s ) (Calculated using the data for a period of 33 years, 1951–84)