The Arade is a river located in the region of the Algarve, southern Portugal. the river's course takes it through the municipalities of Silves, Lagoa and Portimão. The source of the river lies to the southwest of the Serra do Caldeirão mountain ridge, in a valley called Barranco do Pé do Coelho. The river has a total length of 75.0 kilometres (46.6 mi), with its source being 481 metres (1,578 ft) above sea level.