Nine Worlds of Yggdrasil: Differences and Relationships

A medieval Icelandic poet once described the world tree as “the best of trees.” He did not mean its wood. He meant its structure: nine worlds held in its branches and roots, each with its own laws, inhabitants, and relationship to the others. The nine worlds of Yggdrasil are the distinct realms of Norse cosmology, connected by the ash tree Yggdrasil. They differ in environment, inhabitants, and symbolic meaning, and their relationships are defined by the tree’s vertical axis, the rainbow bridge Bifrost, and the three roots that reach into different wells.

Definition: What Are the Nine Worlds?

The nine worlds are the cosmological realms in Old Norse mythology, arranged around the central axis of Yggdrasil. They include Asgard (home of the Æsir gods), Vanaheim (home of the Vanir gods), Alfheim (home of the light elves), Midgard (home of humans), Jotunheim (home of the giants), Svartalfheim (home of the dark elves or dwarves), Nidavellir (another realm of the dwarves), Muspelheim (realm of fire), and Niflheim (realm of ice and mist). Some sources add Hel as a tenth location, but the canonical count in the Eddas is nine. The worlds are not separate planets; they are regions within the tree’s structure, connected by roots, branches, and the bridge Bifrost.

Where Does the List of Nine Worlds Come From?

The primary sources are the Poetic Edda (compiled in the 13th century from earlier oral poems) and the Prose Edda written by the Icelandic historian Snorri Sturluson around 1220. The poem Völuspá (“The Seeress’s Prophecy”) names nine worlds in its opening stanza: “Nine worlds I remember, nine in the tree, / the mighty measuring tree beneath the earth.” Snorri elaborates in Gylfaginning, describing Yggdrasil’s three roots and the worlds they reach. The Överhogdal mix (dated to the 11th–12th centuries) depicts a tree that scholars interpret as Yggdrasil, with figures representing different realms.

The exact list varies between sources. The Völuspá does not name all nine; Snorri’s list is the most complete. Archaeological evidence like the Gosforth Cross (10th century, England) shows scenes from Norse myth, including what may be the tree and the world serpent. The nine worlds were a living cosmology for the Norse, not a fixed doctrine.

How Do the Nine Worlds Differ from Each Other?

Each world has a distinct environment and inhabitants. Asgard is a fortified realm of halls and gold, home to the Æsir gods like Odin, Thor, and Frigg. Vanaheim is fertile and green, home to the Vanir gods of fertility and nature (Njord, Freyr, Freyja). Alfheim is luminous, ruled by the god Freyr, inhabited by light elves. Midgard is the world of humans, surrounded by an ocean inhabited by the serpent Jormungandr. Jotunheim is wild and rocky, home to the giants (jötnar), enemies and sometimes allies of the gods. Svartalfheim and Nidavellir are underground realms of dwarves and dark elves, skilled smiths. Muspelheim is a realm of fire and heat, guarded by the fire giant Surtr. Niflheim is a realm of ice, mist, and darkness, with the spring Hvergelmir at its center.

The differences are not just physical. The inhabitants have different relationships to the gods: elves are benevolent, dwarves are neutral craftsmen, giants are often hostile. The dead go to different places: warriors to Valhalla in Asgard, others to Hel (located in Niflheim) or to the hall of the goddess Ran.

What Are the Relationships Between the Worlds?

Yggdrasil’s three roots define the primary connections. One root reaches into Asgard, where the gods hold council at the well of Urd. Another root reaches into Jotunheim, where the well of Mimir holds wisdom. The third root reaches into Niflheim, where the spring Hvergelmir feeds the rivers. The tree itself is the axis: the upper branches hold Asgard and Vanaheim, the middle trunk holds Midgard, and the lower roots hold the underworld realms.

The rainbow bridge Bifrost connects Asgard to Midgard, allowing the gods to travel to the human world. The squirrel Ratatoskr runs up and down the tree, carrying messages and insults between the eagle at the top and the serpent Nidhogg at the bottom. The relationship between worlds is dynamic: the gods frequently visit Jotunheim for adventures, and the giants sometimes attack Asgard. The final battle of Ragnarok will see the destruction of the boundaries between worlds, as Surtr’s fire consumes the tree.

How Were the Nine Worlds Used in Practice?

The Norse did not build temples to Yggdrasil. The tree was a mental map for understanding the cosmos. Burial practices reflected the dead’s path: ship burials (like the Oseberg ship, 834 AD) were meant to carry the deceased to the afterlife, possibly across the waters surrounding Midgard. The tree also appeared in sacred groves where sacrifices were hung, mimicking Odin’s own sacrifice on Yggdrasil to gain knowledge of the runes. The Hávamál describes Odin hanging on the tree for nine nights, wounded by his own spear.

In modern Heathenry and Ásatrú, the nine worlds are invoked in ritual. A central tree or pillar (the Irminsul in Saxon tradition) represents Yggdrasil. Offerings are made to the gods of each world, and the tree is honored as the axis of the cosmos. The nine worlds also appear in rune magic: each rune is associated with a world or a concept related to the tree.

How Do the Nine Worlds Compare to Other Cosmological Trees?

The Norse world tree is not unique. Siberian shamanic traditions use a world tree or pole that the shaman climbs to reach the spirit world. The Kabbalistic Tree of Life has ten sephiroth connected by paths, similar in structure but different in meaning. The Hindu Ashvattha (sacred fig) is described in the Bhagavad Gita as an inverted tree with roots above and branches below, mirroring Yggdrasil’s three roots. The Greek cosmos had a different model: the sky (Ouranos), earth (Gaia), and underworld (Hades) are stacked, but not connected by a single tree.

What distinguishes Yggdrasil is its active inhabitants: the eagle, the squirrel, the serpent, and the four stags that eat its leaves. The tree is not a static symbol; it is a living being that suffers and will eventually die at Ragnarok. This gives the Norse cosmology a sense of impermanence that other world trees lack.

Common Misconceptions About the Nine Worlds

Misconception 1: There are exactly nine worlds, no more. The Eddas mention nine, but some sources include Hel as a separate world, making ten. Snorri himself is inconsistent. The number nine is symbolic (the number of Odin’s nights, the number of months in a pregnancy), so it may be a poetic convention rather than a strict count.

Misconception 2: The worlds are stacked like a cake. The tree is three-dimensional. Asgard is in the branches, Midgard in the trunk, Hel in the roots. But Jotunheim is to the east, not below. The layout is more like a vertical axis with horizontal extensions.

Misconception 3: The nine worlds are separate planets or dimensions. They are regions within the same cosmic tree, connected by physical paths. The gods walk between them. The bridge Bifrost is a real rainbow that can be seen from Midgard.

Misconception 4: Yggdrasil is a literal ash tree. The tree is a metaphor for the cosmos. The Prose Edda says it is “the best and greatest of all trees,” but its branches cover the whole world. It is not a botanical specimen.

FAQ

How many worlds are there really? The Eddas name nine, but the list is flexible. Some sources include Hel as a separate world, and others omit Nidavellir. Most modern reconstructions use Snorri’s nine.

What is the relationship between Asgard and Midgard? Asgard is the home of the gods, Midgard is the home of humans. They are connected by Bifrost, the rainbow bridge. The gods intervene in Midgard, and some humans (like the hero Sigurd) visit Asgard.

Is Hel one of the nine worlds? Hel is often considered a location within Niflheim, not a separate world. In the Prose Edda, Hel is a realm ruled by the goddess Hel, where those who die of sickness or old age go.

How do the nine worlds connect to each other? Through Yggdrasil’s roots and branches, plus Bifrost. The squirrel Ratatoskr runs messages between the top and bottom. The gods travel via the bridge or by riding through the air.

The Nine Worlds as a Living Map

The nine worlds of Yggdrasil are not a relic of a dead religion. They remain a working model for understanding the Norse cosmos, used by scholars and practitioners alike. To explore further, see our guide to Norse mythology for the full context. For the symbolism of the tree itself, read our glossary entry on Yggdrasil. And for the runes that Odin won from the tree, visit our guide to the Elder Futhark. The tree still stands. Its roots reach into our own time.