The Momar is an adventure race in 30 or 50 km distances.
More information: http://www.mindovermountain.com/momar/schedule/momar_002/momar_002.htm
The Great Lake Walk and Run is around Lake Cowichan each year. It's 56km long.
More information: http://www.greatlakewalk.com/
Run for the Mountain is a trail run race at Westwood Lake that benefits the Mount Benson Regional Park.
More information: http://www.events.runningroom.com/site/?raceId=6995
More information: http://islandrunner.ca/blog/
More information: http://www.randonneurs.bc.ca/schedule/sch_vi.html
The Campbell River 50k is a 50km through the single track near Campbell River Vancouver Island.
More information http://www.islandcupseries.com/index.php/2011/campbell-river-50k-sept-4th/