Cithaeron or Kithairon (Κιθαιρών, -ῶνος) is a mountain and mountain range about 10 mi (16 km) long, in central Greece. The range is the physical boundary between Boeotia in the north and Attica in the south. It is mainly composed of limestone and rises to 4,623 ft (1,409 m). the northeast side of the range is formed by the mountain Pastra.