Lac Opal is a Lake located in Lac-Nilgaut; Pontiac, Quebec and has an elevation of 298 meters.

• Latitude: 46° 18' 44'' North   (decimal: 46.3122221)
• Longitude: 76° 33' 37'' West   (decimal: -76.5602777)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 298 meters
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Opal
• GPS Coordinate Locator Map: Lac Opal Lat/Long