summitpost describes these peaks:
South Twin, a massive giant of the northern Columbia Icefield, is the ninth highest mountain in the Canadian Rockies at 3580m (11,745 ft.) and the fifth highest mountain entirely in Alberta. South Twin, and its nearby twin,North Twin (3730m, 12,237 ft.), dominate the skyline of the northern edge of this immense icefield. South Twin has a steep and sharp profile that creates elegant lines on many aspects of this beautiful mountain.
