It had grasslands with thorny woodland , scrub at upper elevations , swamplands around the lake , and was surrounded by mountains and hills .
The terrain surrounding Zohapilco was a valley central lake system .
Zohapilco had grasslands with thorny woodland , scrub at upper elevations , swamplands around the lake , and was surrounded by mountains and hills .
The terrain surrounding Zohapilco was a valley central lake system .