Tsałtastnu Kaq' is a area located in Matanuska-Susitna County, Alaska. It appears on the Tyonek B-1 SW USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately -8.10 feet (-2.47 m) above sea level. The nearest populated place is Turnagain Heights, approximately 12.2 miles to the ESE.