Doggerland.
A map showing Doggerland, a region of northwest Europe home to Mesolithic people before sea level rose to inundate this area and create the Europe we are familiar with today.
Map via National Geographic magazine.
Most awesome! - AK
map
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Formal Analysis: Nolli and Piranesi
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On stick-charts, the sticks represent wave patterns and shells mark the atolls. Marshall Islands, Micronesia, May 1967.
BlueStraggler:
This is National Geographic’s own site, so I assume that counts as original source, even though it is hosted through Tumblr.