The Geba is a river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 of West Africa

West Africa

West Africa or Western Africa is the westernmost region of the African continent. Geopolitically, the UN definition of Western Africa includes the following 16 countries and an area of approximately 5 million square km:-Flags of West Africa:...

 that rises in Guinea

Guinea

Guinea , officially the Republic of Guinea , is a country in West Africa. Formerly known as French Guinea , it is today sometimes called Guinea-Conakry to distinguish it from its neighbour Guinea-Bissau. Guinea is divided into eight administrative regions and subdivided into thirty-three prefectures...

, passes through Senegal

Senegal

Senegal , officially the Republic of Senegal , is a country in western Africa. It owes its name to the Sénégal River that borders it to the east and north...

, and reaches the Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

 in Guinea-Bissau

Guinea-Bissau

The Republic of Guinea-Bissau is a country in West Africa. It is bordered by Senegal to the north, and Guinea to the south and east, with the Atlantic Ocean to its west....

. It is about 340 miles (547.2 km) in total length.

Its tributary the Colufe River joins the Geba at Bafatá

Bafatá

Bafatá is a town in central Guinea-Bissau, known as the birthplace of Amílcar Cabral. The town has a population of 22,501 .It lies in an area known for its wildlife, including monkeys. Bafatá’s main industry is brickmaking. It is the capital of Bafatá Region as well as the seat of the Roman...

. After passing by Geba

Geba

Geba - the hill, , a Levitical city of Benjamin on the north border of Judah adjacent to Ramah in Benjamin north of Gibeah. It has been identified with Jeb'a, about 5½ miles north of Jerusalem...

 town and Bambadinca, the river broadens into a wide estuary

Estuary

An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea....

 below Xime (where it is joined by the Corubal River

Corubal River

The Corubal is a river of West Africa, a major tributary of the Geba River. It rises near Labe on the Fouta Djallon plateau of Guinea, enters Guinea-Bissau on its eastern border, then meanders generally southwest, nearing the Guinea-Bissauan border, then turns northwest, passes by Xitole, then...

), with a total width of about 10 miles (16.1 km) at Bissau

Bissau

Bissau is the capital city of Guinea-Bissau. The city's borders are conterminous with the Bissau Autonomous Sector. In 2007, the city had an estimated population of 407,424 according to the Instituto Nacional de Estatística e Censos...

.

It has long been an important trade route connecting into the interior; it is accessible to 2,000-ton ships some 90 miles (144.8 km) in, and shallow-draft vessels even further.