Xultún is a large Mayaarchaeological site which once supported a fairly large population, the site is located 40 km northeast of Tikal and 8 km south of the smaller Preclassic site of San Bartolo in northern Guatemala. The site contains a 35 m tall pyramid, two ballcourts, 24 stele (the last of which, Stele 10, dates to 889), several plazas, and five aguadas (water reservoirs). Xultún is the largest-known Classic Maya site that has yet to be archaeologically investigated. Nearby sites include Chaj K’e’k Cué, a site believed to be the residential area of the Xultún elite, containing an 8 meter tall palace, Isla Oasis, and Las Minas. These later sites contain large limestonequarries.
The site of Xultun includes a recently discovered mural with Late-Classic Maya calendar notations relating to lunar astrology.
^William A. Saturno, David Stuart, Anthony F. Aveni, Franco Rossi (11 May 2012). "Ancient Maya Astronomical Tables from Xultun, Guatemala". Science336 (6082): 714–717. doi:10.1126/science.1221444. PMID22582260.
Zender, Marc, and Joel Skidmore, "Unearthing the Heavens: Classic Maya Murals and Astronomical Tables at Xultun, Guatemala". 2012 Mesoweb: www.mesoweb.com/reports/Xultun.html.