The Medas Islands (Illes Medes)
Although the visibility can be good, extensive rainfall sweeps a lot of mud into the water around Estartit and the Medas islands suffer extensively when this happens. Aerial photos taken at such times show the water to be completely brown for a considerable distance from Estartit.
The number of divers to the Medas is regulated to avoid any negative environmental impact, which is policed by the dive centres that use the location. Divers must pay a tax to visit the islands, which may be explicit or hidden in the price of the dive.