Detroit Free Press Chemical Bank pairs with Special Olympics to raise money to give individuals with intellectual disabilities the opportunity to participate in sports training and athletic competition. There are a variety of different races including a kids fun run, marathon, 5K, and much more. The races take place October 13th-15th. Get more info at: http://somi.org/detroitmarathon/index.html#.WR2YsusrKUl
Click to reach the official site
Information about the event is available in : English
The race is run on both sides of the Detroit River, visiting Windsor,ON, Belle Isle and historic neighborhoods of Detroit. So the race is run in the US as well as in Canada.
The course runs in downtown Detroit and Windsor, ON, on both sides of the Detroit River.
The race follows the second half of the marathon. It only runs in the US.