Lac Cyr is a Lake located in Port-Cartier; Sept-Rivières, Quebec and has an elevation of 307 meters.

• Latitude: 49° 38' 31'' North   (decimal: 49.6419908)
• Longitude: 67° 21' 13'' West   (decimal: -67.3535901)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 307 meters
• Location: Port-Cartier; Sept-Rivières
• Atlas of Canada Locator Map: Lac Cyr
• GPS Coordinate Locator Map: Lac Cyr Lat/Long