La Plaine-à-Thomas is a Unincorporated area located in Mont-Alexandre; Le Rocher-Percé, Quebec.

• Latitude: 48° 37' 49'' North   (decimal: 48.6303354)
• Longitude: 64° 35' 43'' West   (decimal: -64.5951574)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Lieu-dit
• Canadian Province/Territory: Quebec
• Location: Mont-Alexandre; Le Rocher-Percé
• Atlas of Canada Locator Map: La Plaine-à-Thomas
• GPS Coordinate Locator Map: La Plaine-à-Thomas Lat/Long