time. Its density was also the highest at 109.1 people per hectare. After the emergence of Teotihuacan, the population dropped off greatly. However, there was another emergence of population in the region of Lake Chalco, and this was around 1400 AD, the population going from 75.0 people per hectare to 150 people per hectare.

It is said that chinampas (in their current form) were introduced to the Chalco-Xochimilco lake bed sometime