I saw them, too, but they were in bigger red canoes.
It's an Atikokan youth summer program. They teach kids wilderness skills, among all the other things a kid needs to know growing up. They send them out individually to spend a night alone, too, after they are a few days in. The groups I have met have been young females. Tough courageous young ladies is what I saw.
I've talked to the leaders before out there. It's a blessing someone still cares for the kids. Not saying people don't, but we need as much of this as possible.
Here's their Facebook page
https://www.facebook.com/AtikokanOutersProgram/