Lac Twamis is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 56° 39' 57'' North   (decimal: 56.6659699)
• Longitude: 67° 42' 54'' West   (decimal: -67.7151167)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Twamis
• GPS Coordinate Locator Map: Lac Twamis Lat/Long