Lac Grassy is a Lake located in Lac-des-Eaux-Mortes; La Mitis, Quebec and has an elevation of 307 meters.

• Latitude: 48° 19' 57'' North   (decimal: 48.3325439)
• Longitude: 67° 57' 18'' West   (decimal: -67.9550083)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 307 meters
• Location: Lac-des-Eaux-Mortes; La Mitis
• Atlas of Canada Locator Map: Lac Grassy
• GPS Coordinate Locator Map: Lac Grassy Lat/Long