Chinampa is an ancient method of Mesoamerican agriculture which uses small, rectangular areas of fertile land to grow crops on the shallow lake beds in the Valley of Mexico. Sometimes referred to as "floating gardens," chinampas were used by the Aztecs starting around 1150. In Tenochtitlan, the chinampas ranged from 300 ft × 15 ft to 300 ft × 30 ft. They were created by staking out the shallow lake bed and then fencing in the rectangle with wattle.
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mudwerks: (via martin klasch: Exploring the Moon) Dreams of Space: “After Apollo - Exploring the Moon” Aerojet-General Spacelines and Rocket Review (1962 edition)