Arctic Exclusive Economic Zones. Note the location of the Arctic Circle inside the larger circle..
CIMSEC provides a look at the legal status of both the Arctic and Antarctic, contrasting the Maritime nature of the Arctic and the continental commons nature of the Antarctic. The post is written by a Coast Guard officer. “CDR Jake Brantley currently serves as Deputy Chief – Coast Guard Office of Future Plans and Operations (CG-35) at CG Headquarters.”
It is a concise look at two complicated subjects. Well worth the time. The accompanying charts here may be helpful.
Chuck Hill's CG Blog 
Don’t forget that the Russians dropped a flag on the floor of the ocean at the North Pole and claim all the way up to the line. This is mostly because they are laying claim to the Lomonosov Ridge has extensive oil and gas reserves.