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

• Latitude: 52° 40' 7'' North   (decimal: 52.6686111)
• Longitude: 76° 22' 7'' West   (decimal: -76.3686111)
• Topography Feature Category: Lake
• Geographical Feature: Partie de réservoir
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Opinaca
• GPS Coordinate Locator Map: Lac Opinaca Lat/Long