Joshua Tree National Park is vast and desolate, covering about 800,000 acres. Two ecosystems come together - one at 3,000 feet dominated by the creosote brush and cholla cactus - the other, slightly higher place is the home of the Joshua Tree. A third ecosystem is located at the westernmost part of the Park above 4,000 feet. This third ecosystem is moister and is the home of five desert fan palm oases, 5 of only 158 in all of North America. Besides the rocks, trees and oases, the park also has many hiking trails, 4WD routes, historic sites and several picturesque campgrounds. You'll find the tumbled granite boulders to which the park owes its recent fame in the high central range. The park features 9 campgrounds with reservations required at Indian Cove, Black Rock Canyon, Cottonwood Group and Sheep’s Pass Group. The others are first come first serve.