Xunantunich is another site of great dimensions, and is located on a natural promontory on the shores of the Mopan River, near the village of Benque Viejo and the border with Guatemala. His most important building is the structure A-6, also known as the Castle, which rises by 131 ft. and is decorated with frieze patterned stucco containing masks and a combination of terrestrial and celestial symbols. The main Palace is located at the southern end of the square and two ball courts. Most important stelae of the site are displayed in the visitor center.

You shall live in the trees and in the vines. There you shall make your nests; there you shall multiply; there you shall increase in the branches of the trees and in the vines.” Thus the deer and the birds were told; they did their duty at once, and all sought their homes and their nests.