One of the most beautiful places in the territory. Located on the southern coast of the Ebro Delta, the Tower of Sant Joan dels Alfacs or Bolitx is a building built by command of King Philip II, probably around 1576, to monitor and reinforce the defence of the port of Los Alfacs.

Currently, it is a ruined structure located 50m in the sea, in a shallow area within the Alfacs Bay, surrounded by the rice paddies of the Ebro Delta.