Serpent Mounds, situated on a bluff overlooking Rice Lake near Peterborough, Ont, is the only known effigy mound in Canada. It is a sinuous earthen structure composed of six separate burial locations and measuring about 60 m long, 8 m wide and 1.5-1.8 m high. Excavation indicated that the mounds forming the effigy were gradually built up between 50 BCE and 300 CE. This would suggest that Serpent Mounds was a sacred place, visited periodically for religious ceremonies. Although pieces of grave furniture were not plentiful, their distribution shows they were restricted largely to individuals of higher status within the community. Those individuals were buried either at the base of the mounds or in shallow, submound pits. The commoners were randomly scattered throughout the mounds' fill.

See also Prehistory.