It crosses the communes of Bastelica, Palneca, Ghisonaccia, Ghisoni, Lugo-di-Nazza, Poggio-di-Nazza, Prunelli-di-Fiumorbo and Serra-di-Fiumorbo.

It forms the border between Palneca and Bastelica as it flows north, then northeast, entering the commune of Ghisoni, Haute-Corse.

It turns to the southeast, passes between the towns of Ghisonaccia and Migliacciaro, enters the sea to the northeast of the Marais de Canna, a wetland.

[4] The concrete gravity dam is owned by Électricité de France (EDF) and is used for hydroelectricity and irrigation.

[8] The Forets du Fiumorbu is classified as a Zone naturelle d'intérêt écologique, faunistique et floristique (ZNIEFF).

Higher up the ZNIEFF is located on the eastern slope of the ridge separating it from the territorial forests of Sant'Antone and Marmano.

The ZNIEFF includes the upper and middle watersheds of the Abatesco and some tributaries of the Fium'Orbu river such as the Saltaruccio and Varagno streams.

Lower down there are stands of maritime pines (Pinus pinaster) and holm oaks (Quercus ilex).

The lido (coastal sand dunes) is heavily used by tourists in the summer, particularly near recently built marinas in the northern half.