Apusiaajik Island is an uninhabited island in the Sermersooq municipality on the southeastern shore of Greenland. It is an outlying island in the Ammassalik archipelago of islands on the coast of the North Atlantic. Air Iceland STOL aircraft approach Kulusuk Airport on the way from Nerlerit Inaat and Reykjavík flying directly over the southern end of the island.
Polar cruises bound for, or returning from the coastal voyages in the Kangertittivaq fjord and the shores of Northeast Greenland National Park often visit the area on their way from/to Tasiilaq. During summer, the glacier edge is also a popular tourist destination for boat trips from Tasiilaq and Kulusuk.
In winter it is possible to cross the frozen sounds on foot or on snowmobile. Several summits on the island attract mountaineers, climbers, and polar adventurers, much as the neighboring Ammassalik Island