Onu-Wahi
The underground kingdom of Mata Nui, home to the Onu-Matoran and Toa Onua.

Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface. is a largely subterranean region of Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years., built from a sprawling network of tunnels, caverns, and mines. It's home to the Onu-MatoranOnu-MatoranEarth-wielding Matoran of the deep who adapted to darkness and built the Matoran Universe's defensive cavalry. and their leader, TuragaTuragaFormer Toa who fulfilled their destiny and transformed into leaders. Turaga wield Noble Kanohi masks and weakened elemental powers, guiding their communities. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui., as well as OnuaOnuaOnua was the Toa Mata and Toa Nuva of Earth, a quiet, deliberate warrior whose patience and underground mastery anchored his team across the Matoran Universe., the Toa of EarthToa of EarthToa of Earth were quiet but exceptional guardians, suited to operating in subterranean darkness where other Toa would fail.. When the Toa Mata first arrived on Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years., TahuTahu (2001)Tahu was the Toa Mata of Fire and leader of the team, from his first landing on Ta-Wahi Beach to the destruction of Teridax's Rahkshi army on Bara Magna with the Golden Armor. discovered Infected KanohiInfected KanohiCorrupted masks were Teridax's primary tool for enslaving Rahi across Mata Nui. in Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface.'s depths, a sign of the shadows to come.
The SubterraneanSubterraneanAn Onu-Matoran defector to the Dark Hunters, armed with maces for underground combat. Kingdom#

Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface. isn't a surface region. It's a sprawling underground complex beneath the earth of Mata NuiMata NuiBuilt by the Great Beings to restore Spherus Magna, Mata Nui sustained an entire civilisation inside his body, was deposed by Teridax, and reclaimed his purpose as a mortal on Bara Magna., consisting of deep tunnels, vast caverns, and extensive mines. The Onu-MatoranOnu-MatoranEarth-wielding Matoran of the deep who adapted to darkness and built the Matoran Universe's defensive cavalry. carved their home here, building Onu-KoroOnu-KoroOnu-Koro was the earth engineers' city, where underground isolation created one of Mata Nui's most self-sufficient settlements, until the Bohrok came. as a hub for mining and resource gathering. The Great MineGreat MineOnu-Koro's most important mining complex, and home to an unexpected gateway to the island's darkest secrets. is the most important landmark, a massive excavation where the Onu-MatoranOnu-MatoranEarth-wielding Matoran of the deep who adapted to darkness and built the Matoran Universe's defensive cavalry. work and which dominates the region's terrain.
TuragaTuragaFormer Toa who fulfilled their destiny and transformed into leaders. Turaga wield Noble Kanohi masks and weakened elemental powers, guiding their communities. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui. presides over this underground society, and Toa OnuaOnuaOnua was the Toa Mata and Toa Nuva of Earth, a quiet, deliberate warrior whose patience and underground mastery anchored his team across the Matoran Universe. protects it with his Earth powers. Movement through Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface.'s tunnels relies on UssalUssalSix-legged crustacean Rahi domesticated across Metru Nui and Mata Nui for cargo, mining, and sport. Backbone of Matoran labor. crabs, creatures the MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. domesticated for transport. The darkness shapes everything about Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface.'s culture. The Onu-MatoranOnu-MatoranEarth-wielding Matoran of the deep who adapted to darkness and built the Matoran Universe's defensive cavalry. are practical and industrious, adapted to underground life in ways the other MatoranMatoranThe most abundant species in the Matoran Universe, chosen by Mata Nui to inhabit and maintain his cosmic body. aren't.
Threats and Trials#
The primary danger in Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface. is the Kofo-JagaKofo-JagaVenomous scorpion Rahi that posed a relentless threat to Onu-Wahi's miners and forced the Toa Nuva to use creative tactics during their search for Kanohi Nuva., fire scorpions that infest the deeper tunnels. These creatures aren't minor annoyances. The developers of the Mata NuiMata Nui (Location)An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years. Online Game originally planned an entire minigame around defending against them. The feature was scrapped before release.
Beyond the Kofo-JagaKofo-JagaVenomous scorpion Rahi that posed a relentless threat to Onu-Wahi's miners and forced the Toa Nuva to use creative tactics during their search for Kanohi Nuva., deeper dangers lurked. WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui. and OnuaOnuaOnua was the Toa Mata and Toa Nuva of Earth, a quiet, deliberate warrior whose patience and underground mastery anchored his team across the Matoran Universe. faced a massive SubterraneanSubterraneanAn Onu-Matoran defector to the Dark Hunters, armed with maces for underground combat. Worm and ManasManasManas are a species of Rahi that exist in two color variants, one black, grey, and yellow and the other white, grey, and orange, and are armed with claws. guardians during their quest for the KanohiKanohiMasks that grant powers and sustain life, they're the most vital artifact in the Matoran Universe. Kaukau NuvaKaukau NuvaThe underwater breathing mask that could suffocate, but the Toa refused to use it as a weapon.. Each encounter revealed the depth of power still at work beneath Mata NuiMata NuiBuilt by the Great Beings to restore Spherus Magna, Mata Nui sustained an entire civilisation inside his body, was deposed by Teridax, and reclaimed his purpose as a mortal on Bara Magna.'s surface.
Story Significance#
Onu-WahiWahiThe Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface.'s role in the early BIONICLEBIONICLE: Matoran AdventuresA 2002 GBA platformer where you play as one of six Matoran fighting Bohrok across Mata Nui's islands. narrative extends far beyond geography. TahuTahu (2001)Tahu was the Toa Mata of Fire and leader of the team, from his first landing on Ta-Wahi Beach to the destruction of Teridax's Rahkshi army on Bara Magna with the Golden Armor.'s discovery of Infected KanohiInfected KanohiCorrupted masks were Teridax's primary tool for enslaving Rahi across Mata Nui. here set the stage for the larger mystery unfolding across Mata NuiMata NuiBuilt by the Great Beings to restore Spherus Magna, Mata Nui sustained an entire civilisation inside his body, was deposed by Teridax, and reclaimed his purpose as a mortal on Bara Magna.. Later, during the search for the Kanohi NuvaKanohi NuvaThe most powerful Masks of Power ever created, granting each Toa Nuva fundamentally enhanced abilities., the region became a proving ground where OnuaOnuaOnua was the Toa Mata and Toa Nuva of Earth, a quiet, deliberate warrior whose patience and underground mastery anchored his team across the Matoran Universe. and WhenuaWhenuaToa Metru of Earth and later Turaga of Onu-Koro, formerly an Onu-Metru archivist whose career in the Archives shaped his role across the rescue of Metru Nui and the long residency on Mata Nui. tested their abilities against genuine hazards. The threats they faced there weren't incidental obstacles. They were harbingers of the greater conflict to come.
Compiled from primary sources by Lore Fortress editorial. Reviewed by Joe Garratt, Editor-in-Chief.
Gallery

Images via BIONICLE Wiki (Biosector01)
Sources
- BookBIONICLE Chronicles 1: Tale of the Toa — Tahu discovers Infected Kanohi while searching in Onu-Wahi
- BookBIONICLE Chronicles 4: Tales of the Masks — Whenua and Onua search for Kanohi Kaukau Nuva in Onu-Wahi
- GameMata Nui Online Game — Onu-Wahi gameplay and Kofo-Jaga threats
- WikiOnu-Wahi — BS01 primary reference
Spotted a factual error or a primary source we missed? Email a correction. Every flagged claim gets reviewed.
Related entries
Wahi
The Matoran word for region. The six Wahi of Mata Nui were the six elemental territories that made up the island before the Bohrok cleared its surface.
Mata Nui (Location)
An island created by accident on the Great Spirit's face, home to the Matoran for a thousand years.
Great Mine
Onu-Koro's most important mining complex, and home to an unexpected gateway to the island's darkest secrets.
Onua
Onua was the Toa Mata and Toa Nuva of Earth, a quiet, deliberate warrior whose patience and underground mastery anchored his team across the Matoran Universe.
Turaga
Former Toa who fulfilled their destiny and transformed into leaders. Turaga wield Noble Kanohi masks and weakened elemental powers, guiding their communities.
Kofo-Jaga
Venomous scorpion Rahi that posed a relentless threat to Onu-Wahi's miners and forced the Toa Nuva to use creative tactics during their search for Kanohi Nuva.
Mentioned in44 entries
Azibo
Azibo was an Onu-Matoran prospector of Onu-Koro whose discovery of the Great Sundial at the bottom of Mine Shaft B opened a concealed passage into Mangaia.
Cavern of Light
The Cavern of Light was the principal Lightstone source on Mata Nui, sealed behind a single Onu-Matoran key and central to the island's illumination infrastructure.
Charms
Small carved stones inscribed with the Three Virtues, the six Principles, and the six Kohlii Skills, used as keys to the six Wahi temples on the island of Mata Nui.
Claws (Nuhvok Va)
Standard-issue tools of the Nuhvok Va, modelled on Onua's Earth Claws and scaled for shallow burrowing and close defence during the Bohrok cleansing.
Fusa
A kangaroo-shaped Rahi native to Po-Wahi and the eastern coast of Mata Nui, known for powerful hind legs and a documented feud with the Muaka.
Hoi
Small turtle Rahi capable of flight, originally native to the Metru Nui coastline and later established in the Le-Wahi swamps and on Voya Nui.
Ko-Koro Guard
The defensive force of Ko-Koro on Mata Nui, also known as the Sanctum Guard, drawn from Ko-Matoran trained for vigilance in the icy peaks.
Koro
The Koros were the six elemental villages established by the Toa Metru on Mata Nui after the Great Rescue, each tied to one element and one Turaga.
Le-Koro Highway
An underground tunnel between Le-Koro and Onu-Koro, delayed by a lightstone shortage, completed by Taipu, and destroyed in the Bohrok awakening.
Mata Nui Military
A decentralized network of village militias defended the island of Mata Nui through the eras of Rahi unrest, the Bohrok War, and the Rahkshi incursions.
Nixie
Nixie was a Ga-Matoran Astronomer of Ga-Koro who tracked the Red Star, recorded prophecies, and supplied Takua with the Gnomon that opened the Onu-Wahi Sundial.
Okoth's Shop
Okoth's Shop sold Air Bladders for five widgets in Ga-Koro on Mata Nui, and it's one of the smallest pieces of canon Bionicle ever bothered to name.
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