The Sierra del Lacandón is a low karstic mountain range in Guatemala and Mexico. It is situated in the north-west of the department of El Petén and the south-east of Chiapas. Its highest points are located near the Mexican border at coordinates17°14′39″N 91°12′08″W / 17.244195°N 91.202145°W and 17°11′42″N 91°05′10″W / 17.195087°N 91.086102°WThe range consists of southeast to northwest trending ridges of folded Cretaceous limestone and dolomite hills rising above the lowlands of the Petén Basin.