The Rocher de Roquerols is a fairly large rock at the bottom of the Thau basin near the Roquerols lighthouse. The rock, discovered at a depth of 9 ft (3 m), did not appear on any map and extends over 16 ft (5 m) on a side for 4.2 ft (1.30 m) high. Lost at the bottom of the Étang de Thau - the largest body of water in the Occitania region - the Rocher de Roquerols was reported by a sailboat that accidentally crossed its path and has since been marked by a buoy.