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When were the present North Sea coastlines probably established?
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North Sea
The North Sea, the Baltic Sea, and the English Channel.
The present coastlines of the North Sea were likely established approximately 3,000 years ago.1
Following the final retreat of the glaciers about 8,000 years ago, rising sea levels caused the North Sea to expand and eventually breach the land bridge that had previously connected Britain to France, allowing the North Sea to join with the English Channel.1