How to quickly describe the Black Sea polygon?

Question

Cartography

Good afternoon!
The project requires calculating the nearest distance from the given objects to the Black Sea. To do this, you need his (sea) training ground.
It will take a very long time to manually deal with its description, are there any options to make it faster?

Answer 1

Export from OpenStreetMap
overpass-turbo.eu/s/p9n (hereinafter referred to as the Export button).