Lac Saint-Gelais is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec.

• Latitude: 50° 21' 15'' North   (decimal: 50.3542360)
• Longitude: 72° 21' 26'' West   (decimal: -72.3573277)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Saint-Gelais
• GPS Coordinate Locator Map: Lac Saint-Gelais Lat/Long