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 413 metres (1,355 ft) and Burrena of 397 metres (1,302 ft) 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.