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Mareb River
The Mareb River (or 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 Mareb at .〔(Eritrea - Ethiopia Boundary Commission Decision Regarding Delimitation of the Border... ), pp. 97, 102〕
== Course ==
According to the ''Statistical Abstract of Ethiopia for 1967/68'', the Mereb River is long. The Ethiopian Ministry of Water Resources reports its Ethiopian catchment area as , with an annual runoff of 0.26 billion cubic meters.〔("Water Sector Development Program (Vol.2)" ) Ministry of Water Resources (accessed 21 January 2009)〕 Other sources talking about a catchmant of to over all, and a discharge of in average over the year, and in peaks.〔(ENVIRONMENTAL IMPACT ASSESSMENT KASSALA )〕 Its headwaters rise south-west of Asmara in central Eritrea. It flows south, bordering Ethiopia, then west through western Eritrea to reach the Sudanese plains near Kassala. Unlike the Setit or Takazze rivers, which flow out of Ethiopia and also forms a natural border with Eritrea, the waters of the Mareb do usually not reach the Nile〔(Adequacy of satellite derived rainfall data for stream flow modeling )〕 but dissipate in the sands of the eastern Sudanese plains.
The Mareb is dry for much of the year, but like the Takazze is subject to sudden floods during the rainy season; only the left bank of the upper course of the Mareb is in Ethiopian territory. Its main tributaries are the Obel River on the right bank (in Eritrea) and the Sarana, Balasa, Mai Shawesh, and 'Engweya Rivers on the left (in Ethiopia).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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