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southward of Korean Pen, westward of Kyushu and the like.
These lay of the land can be formed only after the big bang caused by the bottleneck effect.
One day, massive ice mountains which covered all inland of Cntinents were melted into water and dammed , became great lakes, and for a day or for an hour torrent phenomenons came out once for all.
If not a bottleneck, you cannot see many islands, like on Gulf of Mexico.
Only Cuba stopped by a volcano line.
Britain, Newfoundland, Baffin, Novaya Zemlya, and Arabian Pen.,too.
If like inland sea, you can sure get petroleum.
You cannot find it under Aegean Sea near an outlet of constant stream.
The Crescent Plain, the fixed up line along Jordan to Aqaba, both are apparent traces of the rotation of Arabian Pen..
Certainly, Atlantis cannot have sunken at the same time that something was strewn on the Aegean Sea.
The stream between Japan and Korea can have been skipped over before the current.
Then,Sakhalin as off fiying rings.

Not professional work, just a piece of news presented by the American geographers and geologists.