Previously, the island was called Ydrousa, which means 'rich in water'. Andros has abundance of water. Everywhere, springs, rivers, streams, wetlands with water birds, and even waterfalls can be found. There are as many as 200 water mills. Most of them are unfortunately in bad condition, but they do show the important role the water played on the island, through the centuries. The water of the Sariza Spring in Apoikia is said to have a healing effect. The water is bottled and exported to home and abroad.