Washington State is one of the most geologically and botanically diverse states in the Continental U.S., with annual precipitation ranging from 5 inches to over 200 inches and vegetation types from salt desert to temperate rain forest. The rain shadow of the Cascade Mountains makes most of Eastern Washington relatively dry and characterized by semi-arid rangeland types as well as dry forest types. Although much of the native rangeland was converted to cropland many years ago, large areas of shrub-steppe remain.