Lac Opémisca is a Lake located in Baie-James; Jamésie, Quebec and has an elevation of 362 meters.

• Latitude: 49° 55' 3'' North   (decimal: 49.9175)
• Longitude: 74° 52' 3'' West   (decimal: -74.8675)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 362 meters
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Opémisca
• GPS Coordinate Locator Map: Lac Opémisca Lat/Long