Yosemite Valley is located in the southwestern part of the park. It is about 11 km ( about 7 m) long and bordered by sheer granite cliffs rising about 1200 m (about 4000 ft) above the valley floor. Among its many striking features are El Capitan, a large granite monolith 1095 m (3593 ft) high on the west side of the valley that is popular with rock climbers, and Half Dome, a distinctive 1443-m (4733-ft) rock mass cut in two by natural erosion. Mirror Lake is located at the base of Half Dome. Glacier Point, a cliff 980 m (3214 ft) high and about 50 km (about 30 mi) from Yosemite Valley, provides spectacular views of the entire valley.