Tipi rings are circular patterns of stones left from an encampment of Post-Archaic, protohistoric and historic Native Americans. They are found primarily throughout the Plains of the United States and Canada, and also in the foothills and parks of the Rocky Mountains. Clusters of stones circles are often found in favorable camp-sites, near water, fuel and good hunting grounds. In many cases the clusters are organized in patterns, such as rows, circles or v-shapes. The stones were used to hold down the tipis to keep the lodge warm and dry. In some cases elaborate walls or defensive structures were built.
