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Went to a camping in the Laurentians in Québec (Ste-Agathe) and there were those things near some camp sites. The sites are only accessible by footpaths. No car access. And if you bring a bike, you have to walk it up a hill, so I doubt they are bike racks.
EDIT: I have sent an email to the park and they have been kind enough to reply. It's just a type of fireplace with a grate. They didn't give more info than just this. Thanks to everyone for pitching in!
Hmm. Possibly to place gathered firewood so it doesn't get under foot?
Second on firewood storage.
The sides keep it all in one place, while the top lets you throw a tarp over it to keep wood dry in the rain.
It's definitely not a bike rack, the cross bars would stop it working.
It's definitely not a grill. The concrete would be discoloured, and the base is all wrong.
Yes, precisely couldn't pin point why it wasn't a bike option, thanks, your point on the grill is exactly why I had crossed it off the list of possibilities as well.