The region named Water Forest is one of the forested areas with greatest diversity of fauna and flora of Mexico. It covers 255,000 hectares of forests, grasslands, croplands and human settlements that go from Sierra de las Cruces to Sierra del Chichinautzin. It is mainly communal property (ejidos and comunidades). Apart from providing most of the water that is consumed in 3 of the main cities of the center of the country, it supplies multiple ecosystem services to the most populated area of Mexico. Deforestation, water pollution, air and soil deterioration, together with the unstoppable growth of the urban sprawl, put at risk the survival of thousands of species and millions of citizens who inhabit a region with an alarming water stress.