Magdalena Contreras, Mexico City

La Magdalena Contreras is a borough in the Mexico City. As of the 2010 census, it has a population of 239,086 inhabitants and is the third-least populous of Mexico City's boroughs. It lies at an elevation of 2,365 m above sea level. It is named after two historically important communities—La Magdalena Atlitic and Colonia Contreras. The northern end of the borough is urbanized. The rest of Magdalena Contreras, with its mountains and ravines, is designated as a conservation zone. However, urban sprawl has put pressure on these conservation areas. In an effort to preserve the area's forests and natural resources, the borough government has started promoting ecotourism. The largest ecotourism park is Los Dinamos where canyons and ravines are cut by streams and freshwater springs that eventually form the Río Magdalena, Mexico City’s only remaining free-flowing river. ()