Lac du Soir is a Lake located in Lac-Nilgaut; Pontiac, Quebec and has an elevation of 363 meters.

• Latitude: 47° 16' 1'' North   (decimal: 47.2669444)
• Longitude: 77° 40' 36'' West   (decimal: -77.6766667)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 363 meters
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac du Soir
• GPS Coordinate Locator Map: Lac du Soir Lat/Long