X user Patrick Heizer brings to our attention this geographical oddity. Under the current law of the sea, nations have exclusive economic regulatory authority over a certain distance beyond their territorial seas.
Many of these claims overlap each other or lead to unusual borders for the exclusive economic zones. The Bering Sea Donut Hole refers to one such area that was heavily overfished in the 1980s. Several nations with large fishing fleets rejected American claims to the maritime region.
The Donut Hole Convention (as it was popularly but not officially called) is a 1994 treaty between the United States, Russia, Poland, Korea, Japan, and China determining the status of the area.
There's a somewhat similar international enclave (if that's the correct term) in the middle of the Sea of Okhotsk that is an international zone, despite being surrounded by the Russian EEZ. It's called the Peanut Hole.
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