There's some by Bearskin Airlines using a Fairchild Metroliner that go through northern Ontario

JV 371 YOW-YSB-YAM-YQT
JV 361 YQT-YXL-YHD-YRL-YWG

There's also a few runs by Canadian North using a 737-200, here's one that I'll be taking in August.

5T 444 YEG-YZF-YVQ-YEV

Not quite as long as some posted here, but still useful for getting around a sparsely populated country outside of the main population centres.