Caption: An image from Northern Antiquities (1847), an English translation of the Prose Edda (c.1300--c.1600).

The image is a 19th century attempt to illustrate the Norse cosmology: i.e., mythical cosmology of the Norsemen.

Many pre-spherical-Earth mythical cosmologies may have had a similar structure---a flat Earth (with land and ocean), a dome of the sky (norse version), and an underworld.

Norse cosmology has some optional features: Yggdrasil (the world tree), Joermungandr (the Midgard serpent), and Bifrost (the rainbow bridge).

Credit/Permission: Oluf Olufsen Bagge (1780--1836), 1847 (uploaded to Wikipedia by User:Helios, 2006) / Public domain.
Image link: Wikipedia: File:Yggdrasil.jpg.
Local file: local link: cosmos_norse_yggdrasil.html.
File: Ancient Astronomy file: cosmos_norse_yggdrasil.html.