Figure 1. A) elevation map of northern Europe. Tainiaro is marked as a star near the Arctic Circle; B) the topography of the environs of Tainiaro (and Tainilanrotko) along the Simojoki River, with the sea level set at 76m above current level, representing the ancient shoreline of c. 5000 BC (elevation model 2m resolution by the National Land Survey of Finland, NLSF) (figure by Aki Hakonen).
Note the https://en.wikipedia.org/wiki/Tectonic_uplift since that time.
Thanks!
This week Public TV had an interesting report of about the same age on houaing and buriels in northern Britain that was very interesting. Since the bodies were laid in stone vaults there were skeletal remains even though over 6,000 years old. Orkney Islands (?) if I remember correctly.