|Primary Residents||Different sea creatures|
|Former Residents||Mata Nui|
|Location||Part of the reformed Spherus Magna|
When Mata Nui completed his mission, he was returning to Bara Magna, when he fell into a coma because of a virus which the Brotherhood of Makuta had infected him with, and crashed on Aqua Magna. In the impact, part of the Mainland inside the Matoran Universe broke loose, punched out of Mata Nui's chest and subsequently floated on the surface of Aqua Magna, forming an island which was later known as Voya Nui. Mata Nui's camouflage system also created an island over his head, an island which was later known as the island of Mata Nui.
When the Toa Nuva awoke the great spirit, Makuta Teridax located and possessed Mata Nui's "brain", a bank of machinery far beneath the surface of Metru Nui. When Teridax arose as the new Great Spirit on Aqua Magna, the Island of Mata Nui was broken, destroying the landmass on the surface of the planet.
Makuta Teridax has since left for Bara Magna. Later, during a battle on that planet, a gravity blast from Teridax pulled the moon back toward Bara Magna, and they rejoined. Right before the moon rejoined with Bara Magna, Mata Nui pushed Teridax in the way, and he was crushed, finally killing the traitor.
- "Aqua Magna" is Latin for "great water", or "great sea".
- A shard that had split off from Aqua Magna hit Teridax in the back of the head, killing him and disabling the Matoran Universe.