It is part of the Southern Alps Mountain Range and is flanked by the Hooker Glacier to the southwest and the Tasman Glacier to the east. The mountain has three peaks: The south peak being the lowest at 3,593m/11,788 ft., The middle peak at 3,717m/12,195 ft. and the North peak being the highest at 3,724m/12,218 ft. This is the height of the north peak after the landslide of December 1991 which took 30 meters off the top and also turned the summit into a knife-edge ridge. 