Ko-Wahi is the region of Ice on the island of Mata Nui. It encompasses Mount Ihu, the largest mountain of Mata Nui, beginning in the north at the foothills of the mountain by Onu-Wahi and ending where the mountain merges into the Mangai Volcano, separated by the Tren Krom Break. The entire region is covered in ice and snow; the mountain is largely inhospitable, with only a few species of Rahi being able to successfully survive there. Among the more dominant features of Ko-Wahi are two massive glaciers, separated by a sturdy block on which resides Ko-Koro. The Drifts, massive, nearly featureless snowfields that experience almost constant storm, dominate most of the upper part of the mountain. The most hazardous section of the Drifts is known as the Wastes. Local landmarks include:
-Mount Ihu: A snow-covered mountain in Ko-Wahi, and the largest of several peaks in the region.
-The Drifts: Also known as the Wastes. A snowy region situated on Mount Ihu. Blinding blizzards come often, causing any who venture here to easily become lost, so Ko-Matoran use red flags to find their way.
-The North March: A pass on the bordering the Tren Krom Break on the Ko-Wahi side. There is a cable car to travel from the slopes of Mount Ihu to Ta-Wahi.
-The Massif: A small village at the foot of a great stone half dome with a monastery at its top, the Massif is a place of solitude that some Matoran call home.
-The Academy and Hospital: A center for learning and aid, this pair of complexes is home to several great scholars and scientists who are happy to give their experience for others. New Toa can go there to become better heroes and the sick and wounded can be healed at the hospital. The complex is located a short walk from Ko-Koro and is also connected to the village by an underground ice passage.
-The Dark Walk: One of six large tunnels dug by Makuta’s Rahkshi during the final days of his rule. Large enough to encompass a walking legion, it runs directly from the doorstep of the Koro down into Mangaia. Exudes a definite aura of odiousness, and is generally avoided.
Led by Akiri Matoro, Ko-Koro has become a veritable mountain fortress that sees itself as the crown jewels of Mata Nui, a far cry from the humble monastic feel it held during the days of Makuta. The entrance to the village is now guarded by a great gatehouse and easily sealed by powerful doors and the interior of the village has become greatly reinforced. Along the corners of the interior walls are several guard stations with parapets to watch over every corner of the village. The Sanctum Guard has also been expanded to rival even the Ta-Koro guard in pure might; its several barracks are deeply carved in the ice walls of the village.
Massive bridges of ice, many of which are lined with small shops and tourist traps, span over a huge crevasse. These bridges connect the opposite walls of the village, and these walls are holed out for many more shops and apartments for the wealthier denizens. Poorer villagers are housed in a more central complex on a flat portion of the village in domed huts not unlike those seen elsewhere on the island. At the opposite end of the crevasse from the Koro’s gateway is the towering Sanctum. Though once a temple, it has since been expanded to be a majestic citadel of ice that houses not only the ancient Wall of Prophesy but also a large hall and apartments for Akiri Matoro and his advisors.
The village is fueled by power siphoned from windmills that litter the extreme heights of the stronghold and other peaks of the mountain. These windmills power electric bulbs that light the village’s arches and buildings with white light at night. Wind electricity is also funneled towards powering an aural security system, consisting of a few large, crude microphones at the outskirts of the Koro that can be monitored from within the guard buildings. These allow the Ko-Matoran to hear approaching bodies even over the roar of icy storms.