High Quality Content by WIKIPEDIA articles! Lake Xochimilco is an ancient endorheic lake located in the Valley of Mexico, part of a series of lakes, which included the brackish Lake Texcoco, Lake Zumpango, and Lake Xaltocan and the fresh water Lake Chalco. These lakes were the home of many Mesoamerican cultures, including the Teotihuacanos, the Toltecs, and the Aztecs.