Jiangsu ( listen (help·info)), formerly romanized as Kiangsu, is an eastern-central coastal province of the People's Republic of China. It is one of the leading provinces in finance, education, technology and tourism, with its capital in Nanjing. Jiangsu is the third smallest, but the fifth most populous and the most densely populated of the 23 provinces of the People's Republic of China. Jiangsu has the highest GDP per capita of Chinese provinces and second-highest GDP of Chinese provinces, after Guangdong. Jiangsu borders Shandong in the north, Anhui to the west, and Zhejiang and Shanghai to the south. Jiangsu has a coastline of over 1,000 kilometres (620 mi) along the Yellow Sea, and the Yangtze River passes through the southern part of the province.