The Peterborough lift lock is located on the Otonabee River in the city of Peterborough, Ontario and is Lock 21 on the Trent-Severn Waterway. The dual lifts are the highest hydraulic boat lifts in the world, rising 19.8 m (65 ft).

The Trent-Severn Waterway is a Canadian canal system formerly used for commercial purposes but now exclusively for pleasure boats connecting Lake Ontario at Trenton to the Georgian Bay portion of Lake Huron at Port Severn. Its major natural waterways include the Trent river, Otonabee River, the Kawartha Lakes, Lake Simcoe, Lake Couchiching and the Severn River.

It traverses Southern Ontario's "cottage country" with recreational properties being the primaryindustry along the waterway. It is open for navigation from May untilOctober.
The total length of the waterway is 386 km (240 miles) beginning at Trenton, Ontario, with roughly 32 km of man-made channels.

...info from Wikipedia