The Great Lakes are the largest group of freshwater lakes on the planet. But their future is uncertain.
Every year, a Native American group called the Mother Earth Water Walkers treks hundreds of miles around the Great Lakes to raise awareness of water issues in the region.
This year, the group is making its 2,000 mile trip from Duluth, Minnesota to Matane, Quebec.
Stateside producer Mercedes Mejia caught up with the group near Leamington, Ontario, and learned that the walk is more than a call to action. For many, it's a spiritual journey that connects them to each other and to other indigenous communities.