But wait, wasn't Tenochtitlan a city on a lake? Wasn't it, itself, a city raised from the lake? Its a mystery how it supported itself, how did it actually feed the people?
Glad you asked. Introducing: chināmitl!
Also known as chinampa, these were artificially constructed swaths of farmable land build up by stones, twigs, dirt, and fertilizer. These constructs and their management were so doggone efficient that they could produce up to 4 crops per year!