Lac Joncas is a Lake located in Lac-Jacques-Cartier; La Côte-de-Beaupré, Quebec.

• Latitude: 47° 30' 35'' North   (decimal: 47.5097222)
• Longitude: 71° 29' 27'' West   (decimal: -71.4908333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Jacques-Cartier; La Côte-de-Beaupré
• GPS Coordinate Locator Map: Lac Joncas Lat/Long