Calakmul (/ˌkɑːlɑːkˈmuːl/; also Kalakmul and other less frequent variants) is a Maya archaeological site in the Mexican state of Campeche, deep in the jungles of the greater Petén Basin region. It is 35 kilometres (22 mi) from the Guatemalan border. Calakmul was one of the largest and most powerful ancient cities ever uncovered in the Maya lowlands.
Calakmul was a major Maya power within the northern Petén Basin region of the Yucatán Peninsula of southern Mexico. Calakmul administered a large domain marked by the extensive distribution of their emblem glyph of the snake head sign, to be read "Kaan". Calakmul was the seat of what has been dubbed the Kingdom of the Snake or Snake Kingdom. This Snake Kingdom reigned during most of the Classic period. Calakmul itself is estimated to have had a population of 50,000 people and had governance, at times, over places as far away as 150 kilometers. There are 6,750 ancient structures identified at Calakmul; the largest of which is the great pyramid at the site. Structure 2 is over 45 metres (148 ft) high, making it one of the tallest of the Maya pyramids. Four tombs have been located within the pyramid. Like many temples or pyramids within Mesoamerica the pyramid at Calakmul increased in size by building upon the existing temple to reach its current size. The size of the central monumental architecture is approximately 2 square kilometres (0.77 sq mi) and the whole of the site, mostly covered with dense residential structures, is about 20 square kilometres (7.7 sq mi).
Calakmul is a municipality in the Mexican state of Campeche, situated in the central part of the Yucatán Peninsula.
The municipality (municipio) of Calakmul borders to the east with Quintana Roo (municipalities of José María Morelos, Bacalar, and Othón P. Blanco) and Belize (Orange Walk District); to the south with Guatemala (Petén Department); and to the north and west with other municipalities in Campeche (Candelaria, Champotón, Escárcega and Hopelchén). It covers 13,839.11 km² (5,343.31 sq mi), accounting for 24.34% of the state's total surface area, and is the 10th-largest municipality in area in the country.
The municipality was created on 31 December 1996, from part of the territory of Champotón. On 19 June 1998, the State Congress enacted legislation creating the new municipality of Candelaria as of 1 July of that year, with which Calakmul lost 24% of its population and a portion of its territory.
The 2010 census reported a population of 26,882 persons. The languages spoken in Calakmul include Yucatec Maya, Ch'ol, Chontal, Tzotzil, and others. The municipal seat is the town of Xpujil, a small settlement of 3,984 inhabitants located on Federal Highway 186 as it crosses the base of the peninsula from Escárcega, Campeche, to Chetumal, Quintana Roo.