I'm doing this guide to help you in a place where I've been stuck for at least half an hour, it can be frustrating and I'll be brief and concise.
You'll have to jump with the bash between one bell and another in that order:
Left, Center, Right, Right, Left, Center, Left
By doing so (in this precise order) you can access the swamp.
Order of bells to ring
The solution to the enigma is however banal, in essence there are stones in the background, the high stones correspond to the long bell, the short stones to the central one and those of average height to the right bell and here is revealed the arcane.
Have a good game!