Guangdong (formerly romanised as Kwangtung or Canton Province) is a province in South China, on the South China Sea coast. Guangdong surpassed Henan and Shandong to become the most populous province in China in January 2005, registering 79.1 million permanent residents and 31 million migrants who lived in the province for at least six months of the year; the total population was 104,303,132 in the 2010 census, accounting for 7.79 percent of Mainland China's population. This also makes it the most populous first-level administrative subdivision of any country outside of South Asia, as its population is surpassed only by those of the Pakistani province of Punjab and the Indian states of Bihar, Maharashtra and Uttar Pradesh. The provincial capital Guangzhou and economic hub Shenzhen are among the most populous and important cities in China. The population increase since the census has been modest, the province registering 108,500,000 people in 2015.
Most of the historical Guangdong Province is administered by the People's Republic of China (PRC). However, the archipelagos of Pratas in the South China Sea are controlled by the Republic of China (ROC, a.k.a. Taiwan), and were previously part of Guangdong Province before the Chinese Civil War.
Since 1989, Guangdong has topped the total GDP rankings among all provincial-level divisions, with Jiangsu and Shandong second and third in rank. According to state statistics, Guangdong's GDP in 2017 reached 1.42 trillion US dollars (CNY 8.99 trillion), making its economy roughly the same size as Mexico. Since 1989, Guangdong has had the highest GDP among all provinces of Mainland China. The province contributes approximately 12% of the PRC's national economic output, and is home to the production facilities and offices of a wide-ranging set of Chinese and foreign corporations. Guangdong also hosts the largest import and export fair in China, the Canton Fair, hosted in the provincial capital of Guangzhou.