This naming convention led to much confusion in the early 20th century, as scholars debated whether Teotihuacan or Tula-Hidalgo was the Tollan described by 16th-century chronicles. It now seems clear that may be understood as a generic Nahua term applied to any large settlement. In the Mesoamerican concept of urbanism, and other language equivalents serve as a metaphor, linking the bundles of reeds and rushes that formed part of the lacustrine environment of the Valley of Mexico and the large gathering of people in a city.