In the incomparable setting of Puerto de San Isidro, located at the very heart of the Cantabrian mountains, are the winter springs of Agua de Cuevas. The aquifer is located in a Site of Community Interest, a European ecological network of ecological biodiversity conservation areas.

Right there, in Felechosa, it is bottled at an altitude of 800m to preserve all its properties and all its purity. This spring water has been recognised as Natural Mineral Water since 1995.