 The land neighbouring the Cantabrian Mountains conceals one of the largest concentrations of dolmens in the Basque Country.Proof of this is the narrow spine which starts off near Meano, in the East, and which weaves its way up to Leza, several kilometres to the west.These are the monolithic monuments of El Sotillo, San Martín, Los Llanos and la Chabola de la Hechicera.