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13. The Bridge in Doggerland
Value as of right now: unknown
Years Disappeared: B.C. 6500–6200.
Discovered in 1931
Doggerland was a vast region of territory that served as a link between Great Britain and continental Europe. When sea levels rose, it was inundated, burying the "Bridge" that connected 6,500 and 6,200 B.C. The Doggerland Bridge connected the eastern coast of Great Britain with the Netherlands.

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Pinterest/TThe Doggerland Bridge @Teresawilsonartist
Although frequently flooded, the Doggerland Bridge provided a great habitat for humans throughout the Mesolithic Period. Before being submerged in the ocean by a massive tsunami, it was first reduced to islands. Early in the 20th century, a fishing trawler searching the region unearthed Mesolithic implements and weaponry, along with ancient lion and mammoth fossils, leading to the rediscovery of Doggerland.