Lac Nadeau is a Lake located in Saint-Zénon-du-Lac-Humqui; La Matapédia, Quebec.

• Latitude: 48° 15' 8'' North   (decimal: 48.2522688)
• Longitude: 67° 34' 42'' West   (decimal: -67.5783289)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-Zénon-du-Lac-Humqui; La Matapédia
• Atlas of Canada Locator Map: Lac Nadeau
• GPS Coordinate Locator Map: Lac Nadeau Lat/Long