Hyperborea in ancient and Indo-Persian sources

In the article, relying on ancient written sources, the Indo-Persian mythological tradition, a new view was put forward on the ancient history of the Caspian Sea and the Caspian Oikoumene. The historical and geographical realities of the existence of Hyperborea on the coast of the Middle Caspian, the Gulf of the Northern Ocean (Ocean of Milk) and the island of Hyperboreans on the Mangyshlak threshold were established.