Sites
The Chacoans built their complexes along a 9 mi (14 km) stretch of canyon floor, with the walls of some structures aligned cardinally and others aligned with the 18.6-year cycle of minimum and maximum moonrise and moonset. Nine Great Houses are positioned along the north side of Chaco Wash, at the base of massive sandstone mesas. Other Great Houses are found on mesa tops or in nearby washes and drainage areas. There are fourteen recognized Great Houses, which are grouped below according to geographic positioning with respect to the canyon.
Read more about this topic: Chaco Culture National Historical Park