Wetlands of El Listón and El Aristón Nature · Meco, Cuenca del Medio Jarama, Madrid Image of Meco, not of the place itself. Seasonal lagoons that form in the rainy season between the R-2 industrial estate and the El Encín golf course, prized by birdwatchers as a spot for observing resident and migratory water birds in the Henares corridor. Photo: Rutameco (CC BY-SA 4.0) What to see and do in Meco