Roman Dam of Belas

The Roman Dam of Belas is a 3rd-century structure located in the civil parish of Queluz e Belas, Sintra municipality, Portugal [1]. Constructed to supply water to the ancient city of Olisipo (modern Lisbon), this barrier was built along the Carenque River [1]. While the dam was constructed in the 3rd century, the exact date of its abandonment remains unclear [1].