Burrén and Burrena, known popularly as Las Dos Teticas, are twin hills in Aragon, Spain. They are located in the Fréscano municipal limits, near the road between this town and Mallén.
Burrén has an elevation of and Burrena of above sea level. There are two ancient Iron Age Urnfield culture archaeological sites beneath the hills. These sites have been declared Bien de Interés Cultural in the heritage register of the Spanish Ministry of Culture.
These mountains are isolated hills visible from far away in the flat landscape of northern Campo de Borja comarca.