Gambia River

The Gambia River is a vital waterway in West Africa. It serves as a major geographical feature for several nations. The river begins at the Fouta Djallon plateau in north Guinea. From there, it flows northwest into the Tambacounda Region of Senegal. It passes through the Parc National du Niokolo Koba. Eventually, the river flows through Senegal and The Gambia. It finally meets the Atlantic Ocean at the city of Banjul. The river is most closely linked to The Gambia. This is the smallest country on mainland Africa. The country occupies the downstream half of the river and its two banks.

The river follows a complex and winding path. This winding pattern is called a meandering course. As the water moves, it creates shapes known as oxbows. The river is navigable for about half of its total length. Near the Atlantic Ocean, the river begins to widen significantly. At its mouth, the river can be over one kilometer wide. Small tributaries on the lower stretches are called bolongs or bolons. Examples include the Sami Bolong and the Bintang Bolong. Other bolongs include the Sofancama, Jurunku, Kutang, Nianji, and Sandugu.

Crossing the river is important for travel and trade. Several bridges now span the water. The largest is the Senegambia Bridge between Farafenni and Soma. This bridge opened in January 2019. It connects the North and South Bank of the Trans-Gambia Highway. It also helps trucks from Senegal reach the Casamance province. Other bridges opened in October 2021 at Basse Santa Su and Fatoto. There is also a bridge in Senegal at Gouloumbou. Most other crossings require a ferry or a small boat. A primary ferry crossing exists between Banjul and Barra.

Human history along the river is very long. The Jola, Balante, Bainuk, and Manjak were among the earliest inhabitants. In the 14th century, Mandinka immigrants moved to the region. Oral tradition says Tiramakhan Traore led them from Mali. Some historians believe jula traders led a gradual cultural shift instead. These traders made the Gambia a central part of a trade network. They exchanged salt, shellfish, iron, cloth, ivory, beeswax, gold, slaves, and leather. This trade reached as far as the Niger River.

European explorers also shaped the history of the river. Alvise Cadamosto was the first European to sail the Gambia in 1455. He called the river the Gambra or Cambra. Later, the Duchy of Courland and Semigallia established a permanent base. They used St Andrew's Island in 1651. The English later renamed this St James. For a century and a half, the English and French competed for control. The Scottish explorer Mungo Park traveled the river twice near the turn of the 18th century. He was searching for the Niger River.

Political borders were eventually settled by international agreement. The Anglo-French Convention of 1889 set the limits for the area. It defined the borders of the Gambia Protectorate and Senegal. The borders were set ten kilometers north and south of the river. This measurement went as far inland as Yarbutenda. The eastern border used a 10km radius from the center of Koina. The British controlled the river as far as sea-going vessels could sail. These 1889 borders have remained unchanged ever since.

The river supports a unique biological environment. The aquatic life is part of the Senegal-Gambia Catchments ecoregion. This ecoregion combines the species of the Gambia and Senegal rivers. While species richness is moderately high, many animals are shared. Only three species of frogs and one fish are endemic to this specific area. Endemic means they are found nowhere else. The river also provides food for local people. Women harvest oysters from the river. They use these oysters to make a traditional dish called oyster stew.