Coastal changes in the Netherlands:
http://en.wikipedia.org/wiki/Zuider_Zee
For coastal changes in Britain, I have many paper sources; follow the link in my signature for the pre-modern British coast. (The sealevel was higher still in the Late Iron Age, and some areas represented as marshland there would have been submerged.)
http://en.wikipedia.org/wiki/Zuider_Zee
For coastal changes in Britain, I have many paper sources; follow the link in my signature for the pre-modern British coast. (The sealevel was higher still in the Late Iron Age, and some areas represented as marshland there would have been submerged.)