Jiangsu

| suz = Kaon-sou | j = Gong¹-sou¹ | ci = | y = Gōng-sōu | tl = Kang-soo | order = st }}

Jiangsu; |labels=}}; pinyin: Jiāngsū, alternatively romanized as Kiangsu or Chiangsu}} is an eastern 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, with a population of 84.75 million, and the most densely populated of the 23 provinces of the People's Republic of China. Jiangsu has the highest GDP per capita 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 along the Yellow Sea, and the Yangtze River passes through the southern part of the province.

Since the Sui and Tang dynasties, Jiangsu has been a national economic and commercial center, partly due to the construction of the Grand Canal. Cities such as Nanjing, Suzhou, Wuxi, Changzhou, and Shanghai (separated from Jiangsu in 1927) are all major Chinese economic hubs. Since the initiation of economic reforms in 1990, Jiangsu has become a focal point for economic development. It is widely regarded as one of China's most developed provinces, when measured by its Human Development Index (HDI). Its 2021 nominal GDP per capita reached RMB 137,300 (US$21,287), becoming the first province in China to reach the $20,000 mark.

Jiangsu is home to many of the world's leading exporters of electronic equipment, chemicals and textiles. It has also been China's largest recipient of foreign direct investment since 2006. In 2022, its GDP was more than CNY¥12.29 trillion (US$1.83 trillion in nominal), which is the sixth-highest of all administrative divisions. If it were a country, it would be the twelfth-largest economy as of 2022 as well as the 19th most populous.

Jiangsu is also one of the leading provinces in research and education in China. As of 2022, Jiangsu hosts 168 institutions of higher education, ranking first of all Chinese provinces. Jiangsu has many highly ranked educational institutions, with 16 number of universities listed in the Double First-Class Construction, ranking second after Beijing. As of 2023, four major cities in Jiangsu ranked in the world's top 200 (Nanjing 6th, Suzhou 40th, Zhenjiang 166th and Wuxi 188th) cities by scientific research output, as tracked by the Nature Index.

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