Q'Yaxchilan - Credit: Wikimedia Commons
Yaxchilan () is an ancient Maya city located on the bank of the Usumacinta River in the state of Chiapas, Mexico. In the Late Classic Period Yaxchilan was one of the most powerful Maya states along the course of the Usumacinta River, with Piedras Negras as its major rival.Sharer & Traxler 2006, p. 421 Architectural styles in subordinate sites in the Usumacinta region demonstrate clear differences that mark a clear boundary between the two kingdoms. Read more on Wikipedia
Source: en.wikipedia.org