The Jamma River (Amharic: ጃማ) is a river in central Ethiopia and a tributary to the Abay (or Blue Nile). 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] It has a drainage area of about 15,782 square kilometers in size.[2] Tributaries include the Wanchet.
The earliest mention of this river is in the Gadla of Tekle Haymanot, which was written in the fourteenth century.[3] One of the earliest European mentions is by the missionary Pedro Páez, who was the first European to see and describe the origin of the Abay.[1] According to Johann Ludwig Krapf, in the 1840s the Jamma defined the boundary between Marra Biete and Moret, two districts of the former province or Sultanate of Shewa.[4]
^ ab"Local History in Ethiopia" Archived 2011-05-28 at the Wayback Machine (pdf) The Nordic Africa Institute website (accessed 29 January 2008)
^"Tana & Beles Integrated Water Resources Development: Project Appraisal Document (PAD), Vol.1", World Bank, 2 May 2008 (accessed 5 May 2009)
^G.W.B. Huntingford, The historical geography of Ethiopia from the first century AD to 1704, (Oxford University Press: 1989), p. 69
^Journals of the Rev. Messrs. Isenberg and Krapf, Missionaries of the Church Missionary Society, Detailing their proceedings in the kingdom of Shoa, and journeys in other parts of Abyssinia, in the years 1839, 1840, 1841 and 1842, (London, 1843), p. 290
The JammaRiver (Amharic: ጃማ) is a river in central Ethiopia and a tributary to the Abay (or Blue Nile). It drains parts of the Semien Shewa Zones of the...
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Atronsa Maryam, a church he had built in the area between the Abay and Jammarivers. This church was later notable for its painting of Mary and Christ by...
by Muger River which separates it from East Welega Zone, on the west by Kuyu, on the northwest by Hidabu Abote, on the north by JammaRiver which separates...
part after the historic district of Shewa, Moret, which lay between the JammaRiver and the district of Shewa Meda. Part of the Semien Shewa Zone, Moretna...
bordered on the south and west by the Oromia Region, on the north by the JammaRiver which separates it from Merhabiete, on the northeast by Moretna Jiru...
southwest by the JammaRiver which separated it from Moretna Jiru, on the west by Merhabiete, on the northwest by the Qechene River which separates it...
on the south by Kuyu, on the west by Wara Jarso, on the north by the JammaRiver which separates it from Dera, and on the east by Degem. The major town...
Midir, on the southwest by the JammaRiver which separated it from Moretna Jiru, on the northwest by the Qechene River which separates it from the Debub...
east by Menz Keya Gebreal, and on the southeast by Moretna Jiru. The JammaRiver defines this woreda's southern and eastern boundaries, and its tributary...
River which separates it from the Amhara Region, on the northeast by the JammaRiver which separates it from Dera, and on the east by Hidabu Abote. Towns...
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