Aigues Mort (dead water) is known as the gateway to the Camargue. Aigues Mort was once a sea port but because of silt being washed along the coast, has finished up inland. Covering 16 hectares the town of Aigues Mortes is surrounded by a thick wall, 11 meters high and with 20 towers. the town was used as a departure port by the Crusaders to the Holy lands. On the Constance Tower, with a height of 30 meters there is a lighthouse, that served as a warning light for shipping but was also able to communicate with the Tower of Magne at Nimes. This was a strong Protestant town.