Reindeer Lake, a lake that lies largely in Saskatchewan, touching the northern part of the border between Saskatchewan and Manitoba, Canada. The lake has an area of 2,568 square miles (6,650 km2) and is 140 miles (225 km) long and 10 to 30 miles (16 to 48 km) wide. Reindeer Lake is dotted with islands and is in a wooded region 1,150 feet (350 m) above sea level. It is drained by the Reindeer River, which flows south into the Churchill River.