Answer:
Aztec agriculture in the heart of the empire used chinampas for their crops. Chinampa is a method of farming that used small, rectangular areas to grow crops on the shallow lake beds in the Mexican valley. Chinampas were essentially artificial islands created for the crops.
An area was staked out in the lake bed, usually about thirty by two and a half meters. Once the area was fenced off, the farmers layered it with mud, sediment, and decaying vegetation until it was above the level of the lake. Trees were also often planted in the corners to help secure the area.
These islands then provided rich soil for crops with easy access to water. The farmers used channels between the islands to get to each area by canoe.