The ghost town of Gagnon is located in the territory along Quebec Route 389 which also provides access to Fermont and Labrador City.

The eponymous Mouchalagane River has its source in Sommet and Itomamis Lakes, and flows for 132 kilometres (82 mi) to the south, after which it drains into the Manicouagan Reservoir.

[4] This unorganized territory has 261 lakes, 27 rivers, 23 townships, 11 mountains with toponymic designation, 10 official river portages, three localities, a main road (route 389 linking Baie-Comeau and the Labrador border), four dams on the Hard-Jaune River, two reservoirs, one railroad (linking Port-Cartier to Mont-Wright) and the Uapishka Biodiversity Reserve.

[4] The main rivers of this unorganized territory are: Atticoupi, Beaupin, Beaupré, Blough, Carheil, Félix, Grasse, Hart Jaune (or Uishauneu Shipu), Labadie, La ROnde, Le Gentilhomme, Lillishen, Petite rivière Manicouagan, Petite rivière Manicouagan Ouest, Marsac.

[4] The following named localities are in this unorganized territory:[4] The cantons of the TNO are: Ashini, Audubon, Basset, Belle-Roche, Bernard, Bouat, Brien, Chaumont, Des Groseilliers, Faber, Fagundez, Falaise, Francheville, Gomez, Hachin, Hind, Noël, Roz, Sénécal, Sevestre, Stagni, Thury and Villeray.