Naturism in Central Spain

Pantano de San Juan 

There is an informal and hidden nude beach on the eastern side of the reservoir that is accessed by driving a few kms along an unpaved road.
Río Lozoya 

Parts of the river downstream from the Pinilla reservoir are frequented by naturists.
Las Grullas 
Camino Valdefuentes 4 10185 Benquerencia Cáceres (Spain)
Camping Las Grullas is a naturist campsite in the heart of Extremadura where you can enjoy the beautiful nature and the cultural Unesco sites.