Le Tonnerre Souterrain is a Island located in Caniapiscau; Caniapiscau, Quebec.

• Latitude: 54° 12' 42'' North   (decimal: 54.2117806)
• Longitude: 69° 51' 00'' West   (decimal: -69.8499666)
• Topography Feature Category: Island
• Geographical Feature: Île / Ile
• Canadian Province/Territory: Quebec
• Location: Caniapiscau; Caniapiscau
• Atlas of Canada Locator Map: Le Tonnerre Souterrain
• GPS Coordinate Locator Map: Le Tonnerre Souterrain Lat/Long