Koss River

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Coordinates: 5°13′0″N 32°31′0″E / 5.21667°N 32.51667°E / 5.21667; 32.51667

Koss River
Basin countries Uganda, South Sudan
Left tributaries Shilok River, Ingawi River

The Koss River (Arabic هواشناسی: Khor Koss) is a river that flows in a north of northwest direction through the Eastern Equatoria state of South Sudan, fed by streams from the Imatong Mountains to the west.

The Koss river rises near Ikotos. The head-waters of the river form a waterfall near Laborokala. This is the location of an annual Lango ceremony before the start of the rainy season where a goat is sacrificed and its stomach contents and later its bones are thrown into the stream.[1] The Shilok river, a tributary of the Koss that separates the southeastern part of the Imatong mountains from the Teretenya ridge, joins the Koss not far from its source.[2]

The Koss river divides the lowland area east of the Imatong Mountains from that west of the Lafit, Dongotona and Nangeya Mountains. Streams from these mountains feed the river.[2] The river flows through the Bari country to the east of Torit.[3] Near to Tirangore the river is spanned by a bailey bridge on the Torit-Kapoeta road, built by the Norwegian Church Aid.[4] In 1881, Emin Pasha made a trip from Gondokoro on the Nile to "Tarangole", and from there travelled south along the Koss Valley, and then southwest to the Nile.[2] North of Tirangore, the river passes Lafon and then flows almost due north before being lost in marshland.[5]


  1. ^ Charles Gabriel Seligman, Brenda Z. Seligman (1932). Pagan tribes of the Nilotic Sudan. Routledge & Kegan Paul. p. 356. 
  2. ^ a b c Ib Friis, Kaj Vollesen (1998). Flora of the Sudan-Uganda border area east of the Nile Volume 1. Kgl. Danske Videnskabernes Selskab. pp. 11–21. ISBN 87-7304-297-8. 
  3. ^ Richard Leslie Hill (1967). A biographical dictionary of the Sudan. Routledge. p. 374. ISBN 0-7146-1037-2. 
  4. ^ Benaiah Yongo-Bure (2007). Economic development of southern Sudan. University Press of America. p. 99. ISBN 0-7618-3588-1. 
  5. ^ "Eastern Equatoria State (map)". Gurtong. Retrieved 2011-07-06.