Alaska, Relief

Alaska comprises nine distinct physiographic and environmental regions. Much of the mainland panhandle region, a narrow strip of land 25 to 50 miles (40 to 80 km) wide lying east and south of the St. Elias Mountains, is composed of the Boundary Ranges. There are several large icefields, and the peaks include Mount St. Elias (18,009 feet [5,490 metres]), from whose summit the Alaska-Yukon border swings