Onu-Koro

Onu-Koro was the subterranean village of Earth on Mata Nui. The Onu-Matoran and Turaga Whenua lived here. After the Bohrok were awakened, Nuhvok attacked the village. However, Onua was able to trick them into retreat. Shortly afterward it was attacked and flooded by Gahlok, but not before being evacuated.

When the Toa Mata were transformed into Toa Nuva, Onua's Nuva Symbol appeared in Onu-Koro. Shortly afterwards, it was stolen by a Bohrok-Kal, stripping Onua of his Elemental Powers. The Nuva Symbol was returned to the village after the Bohrok-Kal were defeated by the Toa Nuva.

The village was later severely damaged by the Rahkshi Turahk, Kurahk, and Vorahk, and was deserted by the Matoran when they returned to Metru Nui.

It was then later destroyed by the reawakened Bohrok swarms.