The Green Belt was supposedly caused by the Kanohi Mask of Life. The entrance to the Chamber of Life is somewhere in the green belt. The Matoran Village in it held another secret: the entrance to the Stone Cord that led to Mahri Nui.


Reidak pursuing a Le-Matoran in the Green Belt

Reidak in the bushes.

Reidak once pursuited a Le-Matoran down it in the Piraka/Toa Inika Animations, then Thok captured the same Le Matoran before he discovered the chamber that led to the Mask of Life. It was most likely destroyed when Mata Nui rose from the sea.

Voya Nui
Fire Regions: Mt. ValmaiLake of LavaChamber of LifeLava Reservoirs
Water Regions: The Cape of No HopeLagoon EntranceMahri Nui (Formerly) • Voya Nui Bay
Village Regions: Matoran StrongholdMatoran VillageThe Jungle SanctuaryCanyon Fortress
Piraka Regions: Piraka StrongholdThe Chamber of TruthPiraka Outpost
Ignika Chambers: Staircase to the IgnikaThe Zone of NightmaresThe Chamber of DeathUmbra and Protodax's ChamberLava Chamber Gate
Other Regions: Ring of IceCavern of Historical RecordsDesert of SorrowsThe Green Belt
Lake of ProtodermisNui CavesStone Cord (Destroyed)