Ko-Koro is the village of Ice on Mata Nui.
Ko-Koro is located in Ko-Wahi, hidden beneath a giant block of ice that separates two glaciers and surrounded by huge crevasses. The village itself has a single gate facing a massive crevasse, which is guarded at all times by the Sanctum Guard. The only other known entrance is a tunnel that leads from the Sanctum to the Drifts. Inside the village, the Matoran live in either huts made of ice on the ground, or in rooms carved into the glaciers that surround the village.