n. the extensive administrative division of the Hudson's Bay Company extending from James Bay southward to the Canadas and including the East Main.
1822  (1931)  In the Southern Department (where there is a great want of Talent) I think Mr. Haldane might be useful particularly at Temiscamingue but here he devotes himself more to Legislating than to business.
1927  . . . Moose Factory, then [c1835] the headquarters of what was known as the Southern Department.