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Ralf Roletschek · CC BY-SA 3.0
Landmark Europe wonder

Wadden Sea

3000 BCE – still standing

World's largest unbroken tidal flat system stretching across the Netherlands, Germany, and Denmark

Wikipedia

The opening of the article, and a way into the rest of it without leaving the site.

Wadden Sea on Wikipedia.

Elsewhere in Europe at the time

Records whose own span overlaps this one, found by the same test the canvas draws with. The bar under each card is where it sits inside this one.

See the whole view
Image credits8 pictures from Wikimedia Commons