Las Caldas Cave and the surrounding partial nature reserve (Reserva Natural Parcial de la Cueva de las Caldas) is a protected area covering 45 hectares within the Nalón Valley in the Municipality of Oviedo in the vicinity of the towns of La Piñera and Las Caldas.

The main cavity is around 5 m high and contains a subterranean river.

The cave has no particular geological significance but it is important for the wildlife and archaeological sites from the Solutrean and Magdalenian periods located there.

Archeological excavations in the cave have become one of the most important Upper Paleolithic sites in the Asturias region.

Finds from the cave are of exceptional quality[2] and include amongst others: