Now you touch Atlantis! I am so glad I am following you. And you also touched the subject of the Portolan maps. All music to my ears. Hyperborea could have been one of the branches of a worldwide civilization called "Atlantis". Of all my reads about this subject I encourage people to read the book of the late Arysio Nunes dos Santos, a Brazilian nuclear physicist who wrote about the topic. The book is called "Atlantis, the Lost Continent Finally Found"