The Gravona is a river on the island of Corsica, France. It flows from the center of the island southwest to the Gulf of Ajaccio. Its entire course is in the Corse-du-Sud Department of France. The Gravona Valley conducts the main highway, Route N193, from the capital city, Ajaccio, to the Col de Vizzavona, where it goes through the pass and down to Corte and Bastia. At its upper end the Gravona is a crystal-clear mountain stream cascading over falls and rapids into trout-filled pools. At its lower end nearly all of the Gravona's flow serves to water the densely urban area of Ajaccio.
Below the col the Gravona valley is considered one of the most scenic in Corsica. The river begins with a low gradient and then falls sharply over rapids and falls by stages. Each stage is a pool containing native brown trout. The river is popular for fly fishing and also for white-water canoeing. The road and the rail line remain close to the stream.
Various brooks fall into the Gravona from the sides of the valley, but no rivers of note. At its lower end the waters of the Gravona are entirely commandeered or nearly so as a water supply for the Ajaccio region, which takes up the entire Gulf of Ajaccio. Gravona Canal branches from the right bank about from Ajaccio and follows it more or less in parallel as an aqueduct, entering the city to the north. It was designed in the mid-19th century as a source for the fountains, then a public water supply. Today the main stream of the Gravona flows around a reservoir near the airport, into which water can be shunted. The alluvial plain of the lower river, once called the Campo dell'Oro, is occupied by the airport. After the reservoir the river is joined by a branch of the Prunelli and exits into the gulf. Flow is so diminished that the mouth is nearly entirely blocked by a sandbar across which a small stream may or may not flow.