One of the wider virgin coasts of Europe, with about 35km between the town of Matalascañas and the mouth of the Guadalquivir river. The beaches of Doñana represent an intense dynamism and change their profile constantly due to the sea regressions through the centuries. Testimonies of this are the three watchtowers of the 16^th century located along this coast, which at present give shelter to peregrine falcons.

Southwestern winds cause the continuous transport of sands over the beaches of the National Park, moved afterwards to the inside forming the trains of mobile dunes. On the beach, shelter of thousands of coastal birds, the remains of marine species such as crustaceans and fish accumulate, and often it is possible to find cetaceans and marine turtles.