Boise, the capital of Idaho and the largest city in the state, is the commercial, financial, and cultural center of the northern Rockies region. Known as the "City of Trees," Boise is among the fastest-growing metropolitan areas in the nation. At the same time, the city has maintained a high quality of life through cooperation between business, government, and citizens. An easy blending of historic structures and modern buildings in the downtown district attests to the fact that Boise remains close to its Western heritage while moving with the times. Noted for its mild climate, clean environment, and friendly people, Boise is set in a fertile agricultural area called "Treasure Valley."