The Xalbal River (Spanish pronunciation: [ʃalˈβal]) is a river of Guatemala. Its sources are located in the Sierra de los Cuchumatanes (at 15.497769°N 91.132793°W (Río Xalbal)) in the department of El Quiché, where the river is called Río Xaclbal or Río Chajul. The Xaclbal river flows northwards down the tropical lowlands of Ixcan where it is called Río Xalbal (at 15.954727°N 90.925255°W (Río Xalbal)), and crosses the border with Mexico, where it joins the Lacantún River, a tributary of the Usumacinta river.