Valley of the Cofio River in Valdemaqueda Nature · Valdemaqueda, Sierra Oeste, Madrid Image of Valdemaqueda, not of the place itself. The Cofio, the main tributary of the Alberche, crosses the district between pine and oak woods included in the Alberche and Cofio River Basins Special Area of Conservation, the largest protected area in Madrid at 83,089 hectares. Photo: Esetena (CC BY-SA 4.0) What to see and do in Valdemaqueda