The Sierra de la Culebra, or Serra da Coroa (in Portuguese), is a mountain range in Castile and León, northwest Spain, and northeastern Portugal.

[1] The Sierra de la Culebra is a 95 km long regular mountain chain of medium height, forming a natural border with the Portuguese region of Tras os Montes on its western end.

[3] On the Portuguese side the area of the Sierra de la Culebra range is included in the Montesinho Natural Park.

[4] The number of wolves authorised for hunting each year in Spain is strictly controlled, the auction being carried out in Villardeciervos, but many more are shot illegally.

[5] In the Sierra de la Culebra reserve, wolves may occasionally be observed when attracted to a bait-station, known locally as a Muladar, where remains of dead horses and donkeys are put out for them.