The area in which CEDER Valle del Tiétar operates is the region of Valle del Tiétar, with its headquarters located in Arenas de San Pedro.

The municipalities that participate in the association’s activities are: Arenas de San Pedro, Candeleda, Casavieja, Casillas, Cuevas del Valle, El Arenal, El Hornillo, El Raso, Fresnedilla, Gavilanes, Guisando, Higuera de las Dueñas, Hontanares, La Adrada, La Higuera, Lanzahita, La Parra, Mijares, Mombeltran, Navahondilla, Pedro Bernardo, Piedralaves, Poyales del Hoyo, Ramacastañas, San Esteban del Valle, Santa Cruz del Valle, Santa María del Tiétar, Sotillo de la Adrada, and Villarejo del Valle.