On a similar note, see also Doggerland (the large, submerged peninsula off the north-west coast of Europe, of which the British Isles are the only surviving above-surface relics today):
A lot of previously-inhabited territory -- presumably fertile lowlands! -- was inundated as sea levels rose after the last ice age ended, around 9500-8500 years ago.
There are a lot of geolocations in that area where you can still walk out onto sandbars during low tide. In this map, much of the green zone around Denmark is seasonally 'land'.
Ye auld name for that peninsula, "Jutland", implicates inasmuch.
http://education.nationalgeographic.com/maps/doggerland/
A lot of previously-inhabited territory -- presumably fertile lowlands! -- was inundated as sea levels rose after the last ice age ended, around 9500-8500 years ago.