Low-Tech Kingdom Population Density?

[Turhan's Bey Company]

Originally Posted by Sunrunners_Fire

What is "champa"? (Google tells me about a Hindu kingdom and that it is a named location in Mexico, but nothing I can find about an agricultural method.)

Chinampa. The Aztecs built networks of artificial islands on the lake around Tenochtitlan and grew a mix of corn, beans, and other plants. It was quite enormously productive. Arguably, that may have had less to do with the specific technique and more to do with the facts that a) it involved maize and 2) it was done in a near-tropical climate rather than Europe's more temperate zone, but it still did produce a lot of food.