The Medes Islands are an archipelago made up of about seven small islands and some islets in front of Estartit. It has an approximately surface of 21,5 ha..
It has a privileged seabed, favored by its proximity to the mouth of the river Ter, which attracts many divers who visit them every year, making this marine reserve one of the most important in the Mediterranean and the largest in extension in Catalonia.