Lake Arthur is about 100 kilometres (62 mi) northwest of Port-Cartier, Quebec.

[3] The Cartier Railway runs between Lake Arthur and Grand lac Caotibi.

[2] Lake Arthur has an area of about 11 square kilometres (4.2 sq mi).

[5] A campsite operated by the reserve is accessible from the road that runs along the south of the lake.

[6] On 19 December 2017 the Quebec government announced that a fifth Modik cottage was being built at Lake Arthur at a cost of $247,000.