The forks of the Kings River converge in the Sequoia National Forest, a few miles outside the western boundary of the park, to form the main stem of the river. Here, the river forms one of the deepest canyons in North America, its walls rising as much as from river to rim - about half a mile (0.8 km) deeper than the Grand Canyon. The canyons upstream at Cedar Grove are also more than deep. Although the geology and topography of Cedar Grove and Tehipite Valley are similar to that of Yosemite Valley, the park does not have waterfalls as high and spectacular as those in Yosemite. There are several powerful but short waterfalls including Mist Falls, Roaring River Falls and Grizzly Falls in the Cedar Grove area. The backcountry is home to some much higher falls. Silver Spray Falls in Tehipite Valley drops about in several tiers. In a 1910 article in Out West, Ernestine Winchell describes the falls and Tehipite Valley: