Jamma River

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The Jamma River is a river in central Ethiopia and a tributary of the Abay (or Blue Nile) on its right side. It drains parts of the Semien Shewa Zones of the Amhara and Oromia Regions. The Upper Jamma flows through steep, deep canyons cut first through volcanic rock and then through the Cretaceous sandstone and shaly sandstone, with Jurassic limestone at the bottom.[1]

One of the earliest recorded mentions of the name Jamma is by the missionary Pedro Páez, who was the first European to see and describe the origin of the Abay.[1]

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  1. ^ a b "Local History in Ethiopia" (pdf) The Nordic Africa Institute website (accessed 29 January 2008)
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