Mysterious circles on the ice of lake Lagarfljót. Photo SBG.
Is this the top of the head of Lagarfljotsormur? Photo SBG.
The breaking line in the ice from the place where the head is suppose to be bound. Photo SBG.
A mysterious black island or the back of the wyrm? Photo SBG.
lagarfljotsormur 
I am going to paddle on yhis lake in my kayak. Do I need a permit to perform any kind
of activity?
Dear Edward. The lake is open for everyone to sail or paddle on it. So you don’t need any permission. Just watch out for the humps of the worm if it starts to move.