The Sierra de Chinajá is a low karstic mountain range in Guatemala. It is situated in the north of the department of Alta Verapaz and covers an area of approximately 135 km2 (52 sq mi). Its highest peak has an altitude of 838 m (2,749 ft). The mountain range is isolated from other ranges and forms the last major topographic landform between the highlands of the and the lowland plains of Petén.