"Snake Mountain, the place where civilization was invented...had a ballcourt at its base. In mythology, water from the ballcourt irrigated the land around Snake Mountain and gave abundant harvests to the people. The people of Mutil [Tikal] constructed their Snake Mountain as Temple 33-2nd in the front of the North Acropolis. They identified it by covering its terraces with plaster masks of mountain monsters with snakes emerging from their mouths."
Linda Schele and Peter Mathews, The Code of Kings, p. 73.
The eroded image of Snake Mountain visible today in the North Acropolis has lost much detail, but the reconstruction drawing illustrates how the original looked.