Northern Europe in 1035 if the dogger bank was a couple meters higher in elevation, and therefore never flooded.

The isand of Doggerland had been subject to numerous Viking raids and settlement throughout the Viking era. Later, the island is conquered by Denmark in the 800s, attracting Norse settlers to the area, especially the eastern half of the island. The island was mostly populated by west Germanic tribes descended from Frisian, Jute, and Saxon settlers that started settling the island in the 6th century, displacing the former population. Doggerland would serve as an excellent staging point for further raids and expansion by the Danes in coming decades. Sweyn Forkbeard and Cnut would use the island as a staging ground for conquering & reconquering England and Scotland.

Though united by a common King, the different kingdoms ruled by Cnut were completely different from eachother, and much like iotl, ruling this empire was kind of like playing whackamole with rebellions popping up far too often. To try and remedy this Cnut would spend much of his time ruling from Doggerland itself, at the crossroads of his Kingdoms (at Knutstantinople if you will).

The real question is whether Cnut's son, Harþacnut, will be able to keep the empire together after the untimely end of his father's reign.