Gereb Bi’ati is a reservoir located near Mekelle in the Tigray Region in Ethiopia.

[1] The catchment of the reservoir is 9.71 km² large, with a perimeter of 14.24 km and a length of 4960 metres.

Due to the possibility to by-pass sediment-laden water, the reservoir suffers from less rapid siltation.

[2][3] The lithology of the catchment is Agula Shale and Mekelle Dolerite.

[1] Part of the water that could be used for irrigation is lost through seepage; the positive side-effect is that this contributes to groundwater recharge.