Walhalla

Holland and Nederland are Germania germs meaning Low Lands and by extension the Underworld or Valhalla the submerged Lands.

Similar urban plans with concentric canals were discovered in ancient Neolithic settlements namelyb Spain's Atlantic Shore.

Valahia and Walhalla is there a connection?

Source: Contemporary Shamanic Joirneys volume two Spirituakist Tribes and Communities by SunBow TrueBrother

The Lost northen paradise of the Ancients became the legendary Walhalla of the Scandinavians, the Helluland or the flat land of the Norse, the Hyoerborea of the Helen's and the Thile of the Latins.

The end of the last Ice age saw a drastic rise in the sea levels which marked the disappearance of Atlantis and Lemuria for the most part erasing as well from humanity 's collective memories numerous traces and vestiges of costal population around the world including Hyoerborean civilization with its.megalitic complexes now on the sea floor.

This way vast of regions of prehistoric Europe the original homeland of ancestors were lost into an underwater Underworld, known as Low Lands or Holland of which the Neederland is but a fractional surviving remnant.

Walhalla 

This could be interpreted as related to the intraterestrial cities built by the ancient civilizations some still inhabited to this day.

The same root  is found in the words "hall" and "hallow" a. Ast interior space comparable  to a cave.

The City if Amsterdam itself. Uild near the antique. Cyclopean vestiges with concentric canals alternating around a central point now central station, closely remind of Plato's description of  Atlantis and denote highly sophisticated planning elaborated with long term broad scale coherent vision.

The City logically developed from a.central island and gradually extended iver surrounding marshes by building dikes, channels and artificial islands.