The Mereb River , also known as the Gash River , is a river flowing out of central Eritrea. Its chief importance is defining part of the boundary between Eritrea and Ethiopia, between the point where the Mai Ambassa enters the river at to the confluence of the Balasa with the Mereb at .

Course

According to the Statistical Abstract of Ethiopia for 1967/68, the Mereb River is 440 km long. The Ethiopian Ministry of Water Resources

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