South Marsh is a Bay located in Rainy River, Ontario and has an elevation of 357 meters.

• Latitude: 48° 46' 33'' North   (decimal: 48.7758333)
• Longitude: 92° 35' 24'' West   (decimal: -92.5899999)
• Topography Feature Category: Bay
• Geographical Feature: Bay
• Canadian Province/Territory: Ontario
• Elevation: 357 meters
• Location: Rainy River
• Atlas of Canada Locator Map: South Marsh
• GPS Coordinate Locator Map: South Marsh Lat/Long