The Intensive Monitoring of Forest Ecosystems (ICP-Forests Level II network) consists currently in 14 monitoring plots representing important Spanish Forest Ecosystems distributed throughout the Spanish mainland showing the most common forest situations of each country and representing rare or endemic situations.

The plot 33 Qpe represents the oak Quercus petraea forests in the Cantabrian region. It is a forest stand with high density. There are several beech trees mixed with an understory of holly trees and heather. Climatic gradient is montane, in the Eurosiberian region, The soil is made up of ferruginous slates.