Mahri Nui

Mahri Nui, also known as the Lost Land is the location for the 2007 storyline.

History
Centuries ago, a large fragment of land on Voya Nui sank into the sea. Something in the water quickly began mutating the Matoran, but thankfully the village's impact freed many small air bubbles that they quickly fashioned into protective fields, saving them not only from further mutation, but from drowning in the sea. They soon found that a native kind of Rahi called Hydruka could easily harvest air from a certain kind of seaweed, so they tamed the beasts to do so. Forgetting most of their life on the surface, save for a few fragments, the Matoran named their new home the city of Mahri Nui. They also formed a Council to help everyone work together, Matoran took turns at leadership, and meetings were held monthly to make plans for the future. Every month, Mahri Nui would get fallen gifts from above, but it was really the Voya Nui Matoran throwing tools into the water in rememberance of the lost ones.

Unfortunately, the land sank dangerously close to The Pit, where the Order of Mata Nui condemns the world's most vile beings. Some of those beings, a group of warlords called the Barraki, are now terrorizing the Matoran. Ehlek, especially, wants retribution for the Barraki fortress that Mahri Nui crushed when it sank. However, the Matoran knew little of their attackers, as they never saw more of them than a passing claw or tentacle, they only knew that people kept mysteriously disappearing...

When the Ignika Mask of Life arrived from Voya Nui, things began to change. The Barraki made their presence known to the Matoran, particularly Pridak, who captured a scouting expedition. The Ignika enlarged a Venom Eel to defend itself, and the giant beast threatened Mahri Nui until Defilak shattered its lightstones, hiding the city in shadows. The Barraki then claimed the Mask of Life, causing it to glow so brightly that all of Mahri Nui was blinded by its light.

Mahri Nui Geography

 * Airweed fields: Just outside of the city are fields of the airweed that collect the vital air bubbles needed for the Matoran to survive. Carapar attempted to ransom the Mask of Life from the Matoran by having his Keras armies occupy these fields, but the giant Venom Eel drove them away and ate several hundred of them.
 * Stone cord: A long stretch of rock leading up towards the surface. It connects Mahri Nui to the surface island of Voya Nui, and contains a secret passage between the two.
 * Pillars of Salt: An area at the northern edge of Mahri Nui. Serves as Pridak's favorite hunting grounds.
 * Razor Whale's Teeth: An underwater rock formation in the exact center of Barraki territory. Nocturn likes to hang out there when not serving under Ehlek.