Tikal is the ruin of an ancient city, which was likely to have been called Yax Mutal, found in a rainforest in Guatemala. It is one of the largest archaeological sites and urban centers of the pre-Columbian Maya civilization. It is located in the archaeological region of the Petén Basin in what is now the Petén Department in northern Guatemala. The site is part of Guatemala's Tikal National Park, which was declared a UNESCO World Heritage Site in 1979.