In Norse mythology, the event that marks the beginning of the world is known as Yggdrasil. This cosmic tree serves as the axis mundi, connecting different realms, including heaven, earth, and hell. The creation myth elaborates on how the world emerged from the void of Ginnungagap and the interactions among various beings, such as gods and giants. Yggdrasil's centrality in these narratives illustrates the interconnectedness of existence and the harmony between different realms in Norse cosmology.