The Serra d'Espadà Nature Reserve is located in the south of Castellón province, in the last foothills of the Iberian System, being one of the best kept natural spaces in the whole Valencian Community.

The Sierra de Espadán is a large mountain range with countless springs, cool ravines and shady cork oak woods, spreading over the counties of Alto Mijares, Alto Palancia and la Plana Baixa, between the basins of the river Mijares and the Palancia.
 
The surface area classified as nature reserve takes up roughly 31,000 Ha. This fact has made it the largest extension of Protected Natural Space in the Valencian Community. Of the 19 municipalities connected, 11 have their municipal boundaries within the limits of the nature reserve (Aín, Alcudia de Veo, Almedíjar, Azuébar, Chóvar, Eslida, Fuentes de Ayódar, Higueras, Pavías, Torralba del Pinar and Villamalur); while the other 8 (Alfondeguilla, Algimia de Almonacid, Artana, Ayódar, Matet, Sueras, Tales and Vall de Almonacid), are only partially included.