Oum Er-Rbia (Arabic: أم الربيع‎, the mother of spring), is a river in central Morocco. The river is 555 km long and is the longest in the country. With an average water debit of 105 m³/s, Oum Er-Rbia is the second largest river in Morocco after the Sebou River. It takes source in the Middle Atlas and passes through the city of Khénifra and comes in the Atlantic Ocean in Azemmour. Oum Er-Rbia has six dams, the most important of which is Almassira Dam. Its most important tributaries are El-Abid River, Tessaoute River, and Lakhdar River.

Coordinates: 33°19′12″N 8°20′17″W / 33.320°N 8.338°W / 33.320; -8.338

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