Here is a list of all 10 provinces and three territories campsite reservations site links. Valid as of 2019
Federal - Parks Canada
Parks Canada Reservation system
Provinces:
Alberta
British Columbia
Saskatchewan
Manitoba
Ontario
Quebec
New Brunswick
Nova Scotia
Nova Scotia Parks Reservations
PEI
Prince Edward Island parks Reservation
Newfoundland
NewfoundLand camping Reservations
Territories:
Yukon
North West Territories
Nunavut