The beach of Foz do Arelho – in the northern part of the lagoon – is one of the most frequented. In this place, the lagoon crosses with the Atlantic Ocean. Here you will have the opportunity to swim in the crystal clear waters of the lagoon or enjoy some waves on the ocean side.

Yes, you can swim in the Obidos Lagoon (Lagoa de Óbidos) in Portugal, and it is a favorite spot for families because its waters are significantly calmer and warmer than the adjacent Atlantic Ocean. The best area for swimming is at the Foz do Arelho beach, where the lagoon meets the sea. Here, you can choose between the "ocean side" with its crashing waves and the "lagoon side" with its shallow, crystal-clear tidal pools. In 2026, the lagoon remains a premier destination for water sports like paddleboarding, kayaking, and kitesurfing due to its consistent winds and lack of currents. However, you should check the local water quality flags (the Blue Flag is common here), as the lagoon's narrow opening to the sea can sometimes lead to stagnation in the very far inland reaches during the peak of summer. For the best experience, swim during the incoming tide when fresh seawater flushes the lagoon, providing the most refreshing and cleanest conditions for a dip.