TheEnvironmental Education Center "El Molino de Arriba" is a camping facility for children and young people, con cuatro cabañas de madera. Open menu Close menu. Sierra Norte de Madrid. Territory and peoples. Sierra del Rincón; Valle Alto del Lozoya; Middle of the Lozoya valley; Low Valley of the Lozoya; Sierra de la Cabrera; The Jarama JEmlnG.