"How long is the Gambia River"@en . "The Gambia River is 680 miles (1,094 km) long. It flows into the Atlantic Ocean. The countries within its drainage basin are: The Gambia, Senegal, Guinea"@en . "The Gambia River is 680 miles (1,094 km) long. It flows into the Atlantic Ocean. The countries within its drainage basin are: The Gambia, Senegal, Guinea"@en . . . .