Mount Hood (called Wy'east by the Multnomah tribe), is a stratovolcano in the Cascade Volcanic Arc in northern Oregon, in the Pacific Northwest region of the United States. It is located about 50 miles (80 km) east-southeast of the city of Portland, on the border between Clackamas and Hood River counties. Mount Hood's snow-covered peak rises 11,249 ft (3,429 m) and is home to twelve glaciers. It is the highest mountain in Oregon and the fourth-highest in the Cascade Range. Mount Hood is considered the Oregon volcano most likely to erupt, though based on its history, an explosive eruption is unlikely. Still, the odds of an eruption in the next 30 years are estimated at between 3 and 7 percent, so the USGS characterizes it as "potentially active". The mountain is sometimes informally described as "dormant" ("asleep"). Timberline Lodge is a National Historic Landmark located on the southern flank of Mount Hood just below Palmer Glacier. The mountain has six ski areas: Timberline, Mount Hood Meadows, Ski Bowl, Cooper Spur, Snow Bunny and Summit. They total over 4,600 acres (7.2 mi², 18.6 km²) of skiable terrain; Timberline offers the only year-round lift-served skiing in North America. Mount Hood is part of the Mount Hood National Forest, which has 1.067 million acres (1667 mi², 4318 km²), four designated wilderness areas which total 189,200 acres (295 mi², 766 km²), and more than 1200 mi (1900 km) of hiking trails.