Lagoons of the Velilla gravel pits Nature · Velilla de San Antonio, Área Metropolitana, Madrid Image of Velilla de San Antonio, not of the place itself. El Raso, Picón de los Conejos and El Soto are sheets of water that emerged from former aggregate extraction in the Jarama floodplain; today they are protected wetlands of the Southeast Regional Park and a refuge for birds on migration. Photo: PePeEfe (CC BY-SA 4.0) What to see and do in Velilla de San Antonio