Following the PR from Portillo de Busto, and crossing a spectacular crack in the rock, you reach this peak with impressive views. The mailbox is a few meters behind, on some rocks that I did not dare to climb.
Due to popular beliefs, curative properties are attributed to the Pozo Negro de Santa Casilda. The area recovered by the Friends of Santa Casilda is the perfect place to rest for a while before going up to the Sanctuary.