Arade River starts in the Sierra de Caldeirão, at an altitude of about 481 meters, and flows into the Atlantic Ocean in the town of Portimão, east of Praia da Rocha. It forms a quite small estuary but it has a high ecological value. It is one of the best preserved estuaries in the Algarve region. The Arade estuary is a protected wildlife area that is composed of wetlands where there are abundant waterfowl, including herons, cormorants, gulls, terns, skylarks, kestrels, etc. You can also take a boat trip upstream on the estuary to observe all of the places, landscapes, flora and fauna (it is a great area for bird lovers).