The
Gilão is a river in southern
Portugal. It is approachable from the Atlantic Ocean, where it enters at the town of
Tavira in the
Algarve, east of
Faro. The river Gilão changes its name to
Rio Séqua at the ancient bridge named Ponte Romana in the center of Tavira. The river's source is located in the Serra do Caldeirão mountains of the central Algarve, at the confluence of the Asseca, Zimbral and Alportel rivers, the latter rising north of
São Brás de Alportel. From here it flows in a southeasterly direction and passes through the
Ria Formosa national park south of Tavira, eventually meeting the
Atlantic Ocean between the
barrier islands of
Tavira and Cabanas.