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Here is a link to an article about camps in Canada.

Prisoners of war in POW camps in Canada during WW1 and WW2, an indepth look by David J. Carter

The far northern camps, built in the bush, are all gone now.

The one mentioned at Gravenhurst, Ontario, is about a 3 hour drive north from Toronto, and it has been ( since the war ended ) the Ontario fire training school. The one in Bomanville, is 45 minutes east of Toronto, and after the war it was the St John school for delinquent boys. The Fort Henry site in Kingston, was originally built as a fortress in 1830, as a guardian fort against a possible American invasion. During both WW1 and WW2 it held POWS.

Jim B. Toronto.