Ontario Ultra Series (OUSER)
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The Ontario Ultra Series is a 12 race series run on a variety of courses throughout Ontario, Canada. Each event has its own unique character with a full range of environments and distances from trails and roads, to certified running tracks.
- The Trail Series features 9 races consisting of 25 km to 32 km events.
- The 50K Challenge is a 9 race series consisting of events 50 km to 56 km, both trail and road.
- 2004 will be the 24th annual running of the series.
