Gullies of the Perales River Nature · Chapinería, Sierra Oeste, Madrid Image of Chapinería, not of the place itself. Erosion gullies carved along some two kilometres of the Perales riverbed, listed as a natural area of interest under the Madrid Forestry Act of 1995 for their geomorphological and wildlife value. Photo: Joan Morales (Public domain) What to see and do in Chapinería