It is a resurgence cave, and it is particularly interesting as a subterranean ecosystem and, especially, for its prehistoric deposit from the Solutrean and Magdalenian periods. The main cavity, which is 5 metres high, has three entries: the main one, a smaller one, which acts as a discontinuous resurgence, and the main resurgence, underneath the second one.
The development of the site is simple: from the main entrance, a narrow pass leads to the gallery of the subterranean river.
In times of freshets, part of the flow brims over as a result of the discontinuous resurgence. Upstream, the gallery becomes wider, with a lineal development, nearly devoid of ramifications. In its middle stretch, the chasm of La Figalina appears, joining the main entrance. Following the gallery, we reach a point where it becomes impenetrable, and only the water stream accesses the cavity.
The Partial Natural Reserve of the Cave of Las Caldas is located in the Municipality of Oviedo.
Inside the cave, we must highlight the presence of numerous chiropteran species.