Umqan burials are the most widely known type of mortuary practice found in the Aleutian Islands. The people created burial mounds, that tend to be located on the edge of a bluff. They placed stone and earth over the mound to protect and mark it. Such mounds were first excavated by archeologists in 1972 on Southwestern Unmak Island, and dated to the early contact period. Researchers have found a prevalence of these umqan burials, and concluded it is a regional mortuary practice. It may be considered a pan-Aleutian mortuary practice.