Lac Guerestin is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 58° 52' 34'' North   (decimal: 58.8760432)
• Longitude: 71° 15' 59'' West   (decimal: -71.2662889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Guerestin
• GPS Coordinate Locator Map: Lac Guerestin Lat/Long