Chihuahua is a state in Mexico, with a mainland area of 244,938 square kilometers (94,571.1 sq mi), slightly bigger than the United Kingdom, is in the northwest surrounded by the Mexican states of Sonora, Sinaloa, Durango and Coahuila and the U.S. states of Texas and New Mexico. Although Chihuahua is primarily identified with its namesake, the Chihuahuan Desert, it has more forests than any other Mexican state. On the slope of the Sierra Madre Occidental mountains (around the regions of Casas Grandes, Cuauhtémoc and Parral), there are vast prairies of short yellow grass, the source of the bulk of the state's agricultural production. The state also has a large service sector: tourism, banking and high-tech enterprises. One of the most notable features of Chihuahua is the Barranca del Cobre, or Copper Canyon, a spectacular canyon system larger and deeper than the Grand Canyon. Chihuahua played a pivotal role in the Mexican Revolution and was a battleground between revolutionary forces led by Pancho Villa and federal forces. Chihuahua is one of the Mexican states that holds a slight population plurality of people that are primarily of European ancestry (as is the case in much of northern Mexico), with around 46% of the state population being of European descent, commonly Spanish, Italian, German, French and Dutch. Around 44% of its population has mixed European and Amerindian ancestry (Mestizo). The population of Amerindians in northern Mexico tends to be low compared to the southern part, and Chihuahua is no exception. While there are Amerindians in Chihuahua, they comprise only around 7% of the state's population, and they mostly live in isolated areas in the mountains.