Ouham River Bahr Sarh; Bahr Sara
Map showing the Chari with the Ouham (Bottom center)
Location
Countries	Chad Central African Republic
Cities	Bossangoa Bozoum
Physical characteristics
Source
• location	Central African Republic
• coordinates	6°11′N 15°14′E / 6.183°N 15.233°E / 6.183; 15.233
• elevation	1,139 m (3,737 ft)
Mouth
• location	Chari River north from Sarh, Chad
• coordinates	9°18′59″N 18°13′35″E / 9.31639°N 18.22639°E / 9.31639; 18.22639
• elevation	364 m (1,194 ft)
Length	676 km (420 mi)
Basin size	70,000 km2 (27,000 sq mi)
Discharge
• average	480 m3/s (17,000 cu ft/s)
Basin features
Tributaries
• left	Nana Barya
• right	Fafa

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 Nana-Mambéré and Ouham-Pendé prefectures, crossing into Chad where it joins the Chari about 25 km north of Sarh. Tributaries are the Baba, Fafa, Nana Bakassa, and the 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.^[1] 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)

• Lake Chad replenishment project
• Waterway