The hydrographic slope of Lake Soscumica is accessible via the James Bay Highway (North-South direction) to 22.8 kilometres (14.2 mi) to the East.

The surface of the lake is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The confluence of the Nottaway River with Soscumica Lake is located at 44.4 kilometres (27.6 mi) North of downtown Matagami, Quebec.

Lake Soscumica is located at 19 kilometres (12 mi) South of Kauskwepatinach Hill with a peak of 322 metres (1,056 ft).

[2] The name "Lac Soscumica" was officialized on December 5, 1968 by the Commission de toponymie du Québec when it was created.