Kawartha Lakes kəwôr´thə [key], group of 14 lakes, in a region c.50 mi (80 km) long and c.25 mi (40 km) wide, S Ont., Canada, near the towns of Lindsay and Peterborough. Balsam is the largest lake. They are popular as summer resorts. Many of the lakes form part of the Trent Canal system.
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