For 10 points, name this native myth system of eastern Scandinavia.
This mythology believes that the Milky Way is a path used by migrating birds. In this mythology, the dead cross nine seas and a river to reach Manala, Pohjola, or Tuonela. This mythology believes that the world was formed by Ilmatar, and that a type of harp called the kantele was created by Ilmatar's son (*) Vainamoinen (VIE-nuh-MOI-nen). Vainamoinen appears with Lemminkainen (LEM-in-KAI-nen) and the sampo creator Ilmarinen in the definitive collection of this mythology, the Kalevala. For 10 points, name this native myth system of eastern Scandinavia.
This mythology believes that the Milky Way is a path used by migrating birds.
{Finnish} mythology [accept obvious equivalents]