Wildlife refuge of the Laguna de San Juan Nature · Chinchón, Las Vegas, Madrid Located on the left bank of the Tajuña river, within the municipal boundary of Chinchón, this wetland of about 47 hectares has vegetation differentiated between the páramo and cliff area, the flood-plain area, and the alluvial area where the lagoon itself sits. It was declared a wildlife refuge on 14 February 1991 by decree of the Comunidad de Madrid, signed by president Joaquín Leguina, and published four days later in the regional Official Gazette. Pochards, ducks, marsh harriers and herons nest and winter there, making it one of the largest reservoirs of waterfowl in the region. Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Chinchón