Grand lac Petchedetz is a Lake located in Sainte-Paule; Matane, Quebec.

• Latitude: 48° 42' 10'' North   (decimal: 48.7027999)
• Longitude: 67° 30' 58'' West   (decimal: -67.5160999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Sainte-Paule; Matane
• GPS Coordinate Locator Map: Grand lac Petchedetz Lat/Long