The Kelly Lake Trail on the outskirts of Sudbury Ontario is part of the Trans Canada Trail. It winds along the lake, from one end to the other. An 8.7km hike that's popular for walking, hiking, bird watching and biking.
Approximately 1 km into the Kelly Lake Trail from the East end, you will find the boardwalk which goes through a marsh.
This trail is just off the Trans Canada Highway SW Bypass. A good spot to stop and stretch your legs if you are driving past Sudbury.