Route The Geba 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 in total length. It is largely a lowland river, with a higher flow during the rainy season (from June to October). The areas around the lower reaches of the river are floodplains surrounded by savanna and forest, with a high population density based around
subsistence farming. The mouth of the Geba is a wide
tidal estuary that is shared with the
Corubal River. The
tidal range can be as high as within the estuary (also called the
Geba Channel). Its tributaries include the Anambe, Gambiel, and Campossa (or Colufe) rivers. The
Colufe River joins the Geba at
Bafatá. The Geba shares a broad
estuary with the
Corubal River (which it joins near
Xime).
Bissau, the capital of Guinea-Bissau is located along the north shore of this estuary. The estuary widens further as the river flows into the Atlantic around the
Bijagós Islands archipelago.
Watershed The Geba watershed covers approximately . 65% of the watershed is in Guinea-Bissau, 34% in Senegal, and the small remainder is in the northern corner of Guinea. satellite image of the Bissau-Guinean coast. The river's color is due to silt. The Bijagós Islands are at the bottom-left, surrounding the mouth of the Geba. The Geba, 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. ==Economy==