Lac Day is a Lake located in Rivière-Saint-Jean; La Côte-de-Gaspé, Quebec.

• Latitude: 48° 46' 29'' North   (decimal: 48.7747773)
• Longitude: 64° 50' 11'' West   (decimal: -64.8362794)
• Topography Feature Category: Lake
• Geographical Feature: Étang
• Canadian Province/Territory: Quebec
• Location: Rivière-Saint-Jean; La Côte-de-Gaspé
• Atlas of Canada Locator Map: Lac Day
• GPS Coordinate Locator Map: Lac Day Lat/Long