Which of the following was NOT one of the ways in which the Mayans manipulated their land to farm?

-They drained swamps?

They built elevated fields?

They built berms along rivers?

They terraced hillsides?Hillsides? There are not many hills in their geographical location so I would have to go with terraced hillsides despite what any book has to say. They wouldn't necessarily need to build elevated fields, and in a sense their fields would be "elevated" if they were on hillsides, but I understand old farming methods.
bermss