At the west side of the city is the Zona Esmeralda district (the Lomas de Valle Escondido and surrounding neighborhoods), considered one of the wealthiest in the State of Mexico and Greater Mexico City. The Valle Escondido and Chiluca country clubs are located here.
This passage describes a wealthy neighborhood in Mexico City called Zona Esmeralda, which includes the Lomas de Valle Escondido and surrounding areas. It also mentions that the Valle Escondido and Chiluca country clubs are located there.