Los Angeles County Chinese populations in Los Angeles represent at least 21 of the 34 provincial-level administrative units of China, along with the largest population of Taiwanese-born immigrants outside of Taiwan, making greater Los Angeles home to a diverse population of Chinese people in the United States. Chinese-American cuisine in the Greater Los Angeles area is concentrated in Chinese ethnoburbs rather than traditional Chinatowns. The oldest Chinese ethnoburb is Monterey Park, considered to be the nation's first suburban Chinatown. Although Chinatown in Los Angeles is still a significant commercial center for Chinese immigrants, the majority are centered in the San Gabriel Valley which is the one of the largest concentration of Asian-Americans in the country, stretching from Monterey Park into the cities of Alhambra, San Gabriel, Rosemead, San Marino, South Pasadena, West Covina, Walnut, City of Industry, Diamond Bar, Arcadia, and Temple City. The Valley Boulevard corridor is the main artery of Chinese restaurants in the San Gabriel Valley. Another hub with a significant Chinese population is Irvine (Orange County). More than 200,000 Chinese Americans live in the San Gabriel Valley alone, with over 67% being foreign born. The valley has become a brand-name tourist destination in China, although droughts in California are creating a difficult impact upon its water security and existential viability. Of the ten cities in the United States with the highest proportions of Chinese Americans, the top eight are located in the San Gabriel Valley, making it one of the largest concentrated hubs for Chinese Americans in North America. Some regional styles of Chinese cuisine include Beijing, Chengdu, Chonqing, Dalian, Hangzhou, Hong Kong, Hunan, Mongolian hot pot, Nanjing, Shanghai, Shanxi, Shenyang, Wuxi, Xinjiang, Yunnan, and Wuhan. San Francisco Bay Area Since the early 1990s, many American Chinese restaurants influenced by California cuisine have opened in the San Francisco Bay Area. The trademark dishes of American Chinese cuisine remain on the menu, but there is more emphasis on fresh vegetables, and the selection is vegetarian-friendly. This new cuisine has exotic ingredients like mangos and portobello mushrooms. Brown rice is often offered as an alternative to white rice. Some restaurants substitute grilled wheat flour tortillas for the rice pancakes in mushu dishes. This occurs even in some restaurants that would not otherwise be identified as California Chinese, both the more Westernized places and the more authentic places. There is a Mexican bakery that supplies some restaurants with thinner