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Rideau Canal

The Rideau Canal, a monumental early 19th-century construction covering 202 km of the Rideau and Cataraqui rivers from Ottawa south to Kingston Harbour on Lake Ontario, was built primarily for strategic military purposes at a time when Great Britain and the United States vied for control of the region. The site, one of the first canals to be designed specifically for steam-powered vessels, also features an ensemble of fortifications. It is the best-preserved example of a slackwater canal in North America, demonstrating the use of this European technology on a large scale. It is the only canal dating from the great North American canal-building era of the early 19th century to remain operational along its original line with most of its structures intact.

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The Rideau Canal is the oldest continuously operated canal system in North America. The 19th century canal runs for 202 km from Ottawa, Canada's capital, to Kingston on Lake Ontario. The canal's initial purpose was military, later it opened up the area for settlement and commerce. The canal was completed in 1832.

The 202 kilometres (125 miles) of the Rideau Canal incorporate sections of the Rideau and Cataraqui rivers, as well as several lakes, including the Lower, Upper and Big Rideau lakes. About 19 kilometres (12 miles) of the route is man-made. 

http://www.worldheritagesite.org/sites/rideaucanal.html