West Baranof Island has steep, angular mountains of granitic, non-carbonate sedimentary, metasedimentary, and volcanic rocks in the actively rising Chugach terrane. L’ux, blinking (Mt. Edgecumbe) is the only postglacial volcano in Southeast. Deep ash soils date to its eruptions 12,000 to 14,000 years ago. Angular basalt formations on Saint Lazaria form ideal nesting perches for hundreds of thousands of seabirds, including fork-tailed and Leach’s storm petrels, murres, puffins, gulls and cormorants.
Aside from the low-gradient Edgecumbe peatlands, the province is very rugged. Mt. Annahootz, 4,301 ft, is the highest peak in this province. Here’s a map for the Sitka area: