Made up of four caverns with the names Cova Negra, Cova Blanca, Cova de Lluís Salvador and Cova dels francesos, the famous Cuevas del Drach are all interconnected. These caves formed over time due to the flow of rainwater, with some authorities in the field believing they may date as far back as the Myocene.
They contain a large underwater lake named Llac Martel, some 115m in length and 30m wide. This lake, regarded among the greatest subterranean lakes in the world, features live classical music played on the water every day. The lake may be crossed by boat after the concert.