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.

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)

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