Lac Watisach is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 54° 8' 37'' North   (decimal: 54.1436111)
• Longitude: 78° 35' 45'' West   (decimal: -78.5958333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Watisach
• GPS Coordinate Locator Map: Lac Watisach Lat/Long