Piscina das Mares is a stunning oceanfront tidal pool located in the coastal city of Porto, Portugal. Designed by renowned architect Álvaro Siza Vieira, it blends seamlessly with the natural landscape, offering breathtaking views of the Atlantic Ocean. Opened in 1966, the pool features saltwater and is surrounded by rocky cliffs, making it an iconic architectural and cultural landmark. It combines functionality with artistic beauty, creating a unique space for leisure and relaxation.