It is part of the Nelson River watershed, in the Hudson Bay drainage basin in the Northern Region of Manitoba, Canada.

The name was officially adopted in 1979; Naosap is a Cree word meaning 'fourteen'.

[1] The lakes sits in Churchill River Upland portion of the Midwestern Canadian Shield forests and is surrounded by mixed forest with stands of black spruce, white spruce, jack pine, and trembling aspen.

The shoreline is poorly drained areas of muskeg.

[2] Nasoap Mud Lake is part of the "Mistik Creek Loop", a well-known remote canoe trip which is 95 km (59 mi) in total length and can be paddled in four days.