Qinghai is one of the important province on China's Qinghai-Tibet Plateau. It is famous for the country's largest inland saltwater lake - Qinghai Lake in its territory. Located in the northwest region in China, Qinghai borders on Gansu, Sichuan, Tibet and Xinjiang provinces. It is the source of Chinese two largest rivers Yangtze River and Yellow River; and it is also the birthplace of the Lancang River. It is known as the "source of rivers" and "Chinese water tower".