It is located approximately 12 km (7.5 mi) northeast of Kangerlussuaq.

[1] Aajuitsup Tasia is an oligotrophic lake of 32 m (105 ft) depth, covering an area of 1,350ha.

[2] The 2x10 km[1] lake is separated from the Akuliarusiarsuup Kuua valley and Kangerlussuaq in the south by a low tundra ridge − part of the Kangaamiut dike swarm.

To the west lies a sibling Sanningasoq twin lake.

The altitude differential produces an outflowing boggy stream flowing from Aajuitsup Tasia to the unnamed meltwater lake, allowing Aajuitsup Tasia to retain its freshwater character despite being directly in the glacier outflow path.