Proper noun
A former landmass in the southern North Sea which connected the island of Great Britain to mainland Europe during the last ice age.
By restriction, the region around the Dogger Hills (later, Dogger Island; now Dogger Bank)
Source: en.wiktionary.orgBecause of this, while much of Doggerland would have been permanently flooded, some of it would have persisted as an archipelago of islands — such that had the potential to be inhabited for centuries to come. Source: Internet
By about 8200 years ago, Doggerland had gradually shrunk in size, leaving Dogger Island surrounded by a small archipelago (see image, above left). Source: Internet
Doggerland is an area of low-lying land, flooded more than 8,000 years ago, that connected Lincolnshire to continental Europe and was home to Mesolithic people. Source: Internet
Perhaps Doggerland was Flyland? Source: Internet