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The main route through eastern Washington is I–90. Coming from the west, as you leave the Cascade Mountains and its foothills behind, the terrain turns to desert and sagebrush, before crossing over the Columbia River and reaching the irrigated areas where fields of crops grow. In this area's barren, dry lands a new type of farming has emerged—wind farms with giant turbines that transform the landscape and provide electricity. The southeast part of the state offers a more verdant setting—rolling hills and fields where rain helps produce abundant crops of grains and wine grapes. The northeast part of the state is flanked by three mountain ranges (Selkirk, Okanogan, and Kettle River), which are considered foothills of the Rocky Mountains; this area is rich with lakes, rivers, cliffs, and meadows, and home to diverse wildlife.