The Mountain Stronghold was the fortress for the Voya Nui Resistance Team. According to the Matoran, it was built in the time before Voya Nui split off from the Mainland. It appeared on VNOG, on Inika Island Assault where Avak appeared as boss, and on Matoran Escape, where Thok was the chapter boss.
It was destroyed when Voya Nui returned to the Southern Continent.
| Fire Regions: Mt. Valmai • Lake of Lava • Chamber of Life • Lava Reservoirs|
Water Regions: The Cape of No Hope • Lagoon Entrance • Mahri Nui (Formerly) • Voya Nui Bay
Village Regions: Matoran Stronghold • Matoran Village • The Jungle Sanctuary • Canyon Fortress
Piraka Regions: Piraka Stronghold • The Chamber of Truth • Piraka Outpost
Ignika Chambers: Staircase to the Ignika • The Zone of Nightmares • The Chamber of Death • Umbra and Protodax's Chamber • Lava Chamber Gate
Other Regions: Ring of Ice • Cavern of Historical Records • Desert of Sorrows • The Green Belt
Lake of Protodermis • Nui Caves • Stone Cord (Destroyed)