Lac Rosanna is a Lake located in Rivière-Éternité; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 7' 55'' North   (decimal: 48.1319736)
• Longitude: 70° 29' 26'' West   (decimal: -70.4906295)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Éternité; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Rosanna
• GPS Coordinate Locator Map: Lac Rosanna Lat/Long