Tarajornitsut is an uninhabited tundra highland in the Qeqqata municipality in central-western Greenland, within the bounds of Kangaamiut dike swarm. The highland has many lakes, shallow valleys, hills, and wetlands, with plentiful wildlife, such as arctic geese. It is also a major calving ground for reindeer. In the future the area will become a protected nature reserve. The Polar Route from Sisimiut to Kangerlussuaq ends in Tarajornitsut, on the shore of Kangerlussuaq Fjord.
Tarajornitsut is located north of Kangerlussuaq Fjord, behind the dike scarp bounding the fjord from the northwest. The eastern part of the wide highland region of numerous lakes (some of which are saline), wet valley depressions, and mostly barren hills, begins immediately to the north of Kangerlussuaq, and is bounded from the east by the large Sanningasoq lake.
The long Tasersuaq lake in the west separates the highland from the Pingu mountain group halfway between Davis Strait and the Greenland ice sheet (Greenlandic: Sermersuaq). The range flattens considerably to the northwest of Tarajornitsut, due to pressure exerted by the icesheet for long periods in the past.
The entire region is part of the tundra biome, with the depressions and lakes being an important site for migrating birds, such as geese. The northern and northeastern part of the region is an important calving ground for the reindeer. The wetlands in the heart of Tarajornitsut dominate the depressions. Protected by the hills on the eastern side, they are deprived of wind blowing from the icesheet. Still water in these depressions is an incubator for billions of mosquitoes during the summer season.