The Geba (French: Rivière Geba, Portuguese: Rio Geba) is a river of West Africa that rises in the northernmost area of Guinea in the Fouta Djallon highlands, passes through southern Senegal, and reaches the Atlantic Ocean in Guinea-Bissau. It is about 550 kilometres (340 mi) in total length.^[3]

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Geba
Geba River in Guinea-Bissau
Map of Senegal, Guinea and Guinea-Bissau with the catchment area of Geba (light green)
Location
Countries	Guinea Senegal Guinea-Bissau
Physical characteristics
Source
• location	Fouta Djallon highlands, Guinea
Mouth
• location	Atlantic Ocean
• coordinates	11°43′20″N 15°38′40″W
Length	255 km (158 mi)[1]
Basin size	12,359.6 km2 (4,772.1 sq mi)[1]
Discharge
• location	Near mouth
• average	(Period: 1979–2015) 6.91 km3/a (219 m3/s)[2] (Period: 1971–2000) 127 m3/s (4,500 cu ft/s)[1]
Basin features
River system	Geba River
Tributaries
• left	Bidigor, Colufe, Undauma
• right	Anambé

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In Senegal, the river is locally known as the Kayanga.

Its tributary the Colufe River joins the Geba at Bafatá. After passing by Geba town and Bambadinca, the river broadens into a wide estuary below Xime (where it is joined by the Corubal River), with a total width of about 15 kilometres (9.3 mi) at Bissau.^[3] The estuary widens further as the river flows into the Atlantic, forming the Bissagos Islands archipelago.

The Geba River, along with the Corubal River, drains the Bafatá Plateau. It also drains the Gabú Plain, along with the Farim River (also known as the Cacheu River), and their tributaries.^[4]

It has long been an important trade route connecting into the interior; it is accessible to 2,000-ton ships some 140 kilometres (87 mi) in, and shallow-draft vessels even further.