Oregon's Central Cascades are a haven for outdoor adventurers. Visitors can choose to hike and camp in areas such as Newberry National Volcanic Monument, Deschutes National Forest and the Three Sisters Wilderness. In the wintertime, try downhill and cross-country skiing, both of which are available at Mt. Bachelor Ski Area. Enjoy a soak in several natural hot springs, the more developed Breitenbush of Detroit or hike into Terwilliger Hot Springs of Blue River. Bend, the area's largest center, is a perfect base for exploration as it provides a convenient location to several state parks, including Fort Rock and Tumalo. People of all ages are invited to learn about nature through a series of classes, programs and attractions at the Sunriver Nature Center and Observatory. The Cascade Range stretches over 700 mi (1127 km) north from California through Oregon to Washington, running parallel to the Pacific Ocean, including such landmarks as Mount St. Helen's.