The Juan De Fuca Marine Trail is a 47 km shoreline trail on the south-west coast of Vancouver Island. Starting just south of Port Renfrew at Botanical Beach, this trail winds itself down the coast ending at China beach. Typically done as a hike in 3-4 days.
 

Derrick Spafford posted this unusual route which crosses 13 frozen lakes:

This is a beautiful 84km winter route that I established on March 17, 2014 in a time of 13h43m28s. 

Eliza Murphy posted the route:

"The Cataraqui Trail is a year-round, shared-use recreation trail running [about 103km] from Smith Falls in the east to Strathcona in the west.

In spring, summer and fall it welcomes everyone from hikers to cyclists. In winter it is open to snowmobilers bearing a current Ontario Federation of Snowmobile Clubs trail permit. Cross-country skiers are welcome to share the trail."

www.cataraquitrail.ca/#!/rail-to-trail

These routes are described here: https://www.pc.gc.ca/en/pn-np/nl/grosmorne/activ/experiences/backcountry

Eric Batty posted the route with a detailed TR (8/19/2012):

A few weeks ago my wife [Eden] and I linked the North rim and the Long Range traverse in Gros Morne NP, Newfoundland. We did the 69.9km of trail route in 2 days 8hrs 25mins. It was one of the best routes I have ever done! 

https://www.canadiangeographic.ca/article/hiking-la-traversee-de-charlevoix

La Traversée is a 105-kilometre hiking, cross-country skiing and mountain biking route through the Laurentians in the Charlevoix region, a 560,000-hectare UNESCO Biosphere Reserve about an hour’s drive east of Québec on the north shore of the St. Lawrence River.

https://www.traverseedecharlevoix.qc.ca/