18 Mile Reef is a Shoal located in Range 5 Coast Land District, British Columbia.

• Latitude: 54° 35' 36'' North   (decimal: 54.5932999)
• Longitude: 124° 42' 30'' West   (decimal: -124.7083000)
• Topography Feature Category: Shoal
• Geographical Feature: Reef
• Canadian Province/Territory: British Columbia
• Location: Range 5 Coast Land District
• Atlas of Canada Locator Map: 18 Mile Reef
• GPS Coordinate Locator Map: 18 Mile Reef Lat/Long