Trasierra/Tierras de Granadilla (Extremaduran: Transierra - Granaílla), traditionally known as Tierras de Granadilla, is a comarca at the northern end of province of Cáceres in Extremadura, one of Spain's seventeen Autonomous Communities.

Its origins as an administrative unit date back to the establishment of the House of Alba in the 15th century.

Until 1833 the Tierras de Granadilla historical region the five towns of las Hurdes, the villages of La Alberca and Sotoserrano (now in Salamanca Province, Castile and León), as well as the western part of Aldeanueva del Camino, which is now part of the Valle de Ambroz comarca to the east.

The southern limit of Tierras de Granadilla is marked by the ancient commercial path known as "Via de la Plata", which is known locally as "lindón".

[3] The Mancomunidad includes villages that were not part of the historical region, like Oliva de Plasencia, Jarilla and Cabezabellosa.