Yaxchilan means "green stones" in Mayan. The ruins lie on the left bank of the Usumacinta River just a little north and east of the ruins of Bonampak. Yaxchilán was a large city in ancient times rivaling the magnificence of Palenque and Chichen Itzá. The building groups lie along slender esplanades set into the bank of the river. It seems to be influenced by Palenque more than the Peten region of Guatemala. The roof-combs of the buildings are wider and higher than those of Palenque. The core area of the site is the Grand Plaza. It is composed of two major groups named the Grand Acropolis and the Small Acropolis. As with other groups at the site, these two were built making use of and modifying the lay of the land. There are 120 structures which make up the core area, around 30 have been partially restored. Yaxchilán served as an important Classic Maya regional capital rivaling, if not surpassing, Piedras Negras in its architectural grandeur and size. Yaxchilán, although mostly un-restored remains in better condition than Piedras Negras probably due to the use of stone lentils and a higher quality of engineering.