Marismas del Río Piedras y Flecha de El Rompido Nature · Cartaya, Costa Occidental, Huelva Estuary of the río Piedras with a continuously growing sand spit separating the sea from the marshland; alongside it, the small fishing port of El Rompido and its oyster farms. Photo: Daniel Toscano Díaz (CC BY-SA 3.0) What to see and do in Cartaya