The Atlantic coast beach of Praia de Odeceixe Mar straddles the border between the Algarve and Alentejo regions of Portugal. It is situated at the mouth of the River Seixe (Rio de Seixe) which forms the border and lays down a lush green valley leading to the beach.
Odeceixe is a big sandy beach that is popular with surfers. The break around the river mouth can be especially good. At the northern end there are steep, sheer cliffs.
At the far southern end is a small cove (Praia de Adegas) which is a designated nudist beach.