Located on the southern coast of the Ebro Delta, the Tower of Sant Joan dels Alfacs is a building that was built by royal order of Philip II, probably around 1576, to monitor and strengthen the defense. from the port of Alfacs. It is currently a ruined structure 50m into the sea, in a shallow area within the Alfacs Bay, surrounded by rice fields in the Ebro Delta. It is an ideal spot for bird watching.