Mersey River in Kejimkujik National Park is one of the best places to canoe in Canada. There are numerous navigable lakes and rivers forming an interconnected system between Fundy Bay and Kejimkujik Lake. There's a large range of pH in the lakes -- some lakes have 'brown water," so the area supports a huge range of sport fish.
If you go:
Canoeing is about the only way to see most of this park.
Links:

Main Parkway
Jeremy's Bay Campground Road
Annapolis County
Maitland Bridge, Nova Scotia B0T 1B0 Canada
kejimkujik. info@pc.gc.ca
Mailing address:
Box 236
Annapolis County
Maitland Bridge, NS B0T 1B0 Canada
Phone Numbers:
Park Information
+1 (902) 682-2772
+1 (902) 682-2772