Long Mountain Lake is a Lake located in Cassiar Land District, British Columbia.

• Latitude: 59° 18' North   (decimal: 59.2999999)
• Longitude: 126° 39' West   (decimal: -126.6499999)
• Topography Feature Category: Lake
• Geographical Feature: Lake
• Canadian Province/Territory: British Columbia
• Location: Cassiar Land District
• Atlas of Canada Locator Map: Long Mountain Lake
• GPS Coordinate Locator Map: Long Mountain Lake Lat/Long