Qa'itsusi is a island located in Matanuska-Susitna County, Alaska. It appears on the Tyonek C-2 SW USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 41.25 feet (12.57 m) above sea level. The nearest populated place is Susitna, approximately 3.2 miles to the NNE.