Like all the rias of the Country of Quimperlé, these two, like all the others, each shelter a unique port. The ria Aven, loacted in the east of Riec-sur-Bélon, protects the small marina of Rosbras whilst in the west, the ria Bélon shelters the Bélon port.

The port of Bélon spreads across both banks, on the Riec-sur-Bélon side to the right and on Moëlan-sur-Mer side to the left. You can buy fish directly from the fishermen on the left bank. As for the other bank it is devoted to the production of the Bélon flat oyster.

These two rias are also perfect places for those wishing to relax on the beach - Kerfany-les-Pins and  Questeland await -  but also for those wishing to practice sport. There is something for everyone: kayak, canoe, fishing, horse riding with Equibreizh passing through and excursions with the GR 34, and the Route of Santiago de Compostella.