The Ontario Provincial Police says boating fatalities on OPP-patrolled waterways reached an eight-year high in 2017.
They say 31 people died last year, compared to 23 deaths in 2016.
Falling overboard was the leading contributing factor both years.
Boat operators and passengers are being urged to wear a personal flotation device or life jacket while out on the water, and not operate any watercraft while impaired. Also, operators must be licensed, and have all the required safety equipment onboard.
Police remind boaters that the water is still very cold this time of year.