| Tiua Stronghold
The Tiua Stronghold was a massive fortress located in the northeast area of the Southern Country of the Isle of Tiuarga Nui.
The Tiua Stronghold was created by surviving sane Matoran of the Southern Country shortly after the massive overflow of Lake Acais as a fortified defense against the crazed Matoran affected by the repercussions. The stronghold survived for centuries after the overflow until a planned invasion was launched against it. The Matoran within the structure were brutally murdered and the fortress itself was obliterated. Of all the Matoran who had existed within the stronghold, only the Pe-Matoran Kheperå survived.
|Dome of Tiuarga Nui|
|Arkai | Kofu Nui | Maie Nui | Tiuarga Nui|
|Crescent Bay | Ginta River | Isolated Crystal Mines | Ki-Koro | Lake Acais | Lake Kulia|
Mountains of Kia | Ota-Wahi | Schizo Mountains | Tiua-Koro | Tiua Stronghold (Gate of Separation)