Yeah Netherlands and those Islands along the german & polish coast in the Baltic Sea that got washed away in a big storm
The Cambridge fens (UK) were under water at that time too (they were drained with the help of the Dutch)
I think the coastline of the southeast of the UK changed in the 1200s due to a massive storm. What are inland hills now were islands.
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For those wondering, this is what the Netherlands actually looked like through the centuries
as long as we sink the Noordoostpolder and disconnect Urk from the mainland again I'm up for anything
Imagine having a cute little house overlooking a lake or a bay and some asshole fills it in
Post China next. It's always funny seeing where the Yellow River is at any given time period. Also does anyone know why the Bohai Sea has shrunk over the last couple millennia?
edit: wait this is fake! The Zuiderzee Works were NOT built in the 12th century. 😠
There was the mini ice age somewhere in the early 1000s. Wasn't sure if that expanded glaciers over Northern Europe or something
I'm pretty sure thats just land below the sea, but at a higher elevation.
Drain the sea
Bring back Doggerland
when the balkanization so granular you can't even draw borders 
