Guangdong (UKgwæŋˈdʊŋ, USgwɑːN-), formerly romanized as Canton or Kwangtung, is a coastal province in South China on the north shore of the South China Sea. The capital of the province is Guangzhou. With a population of 126.84 million (as of 2021) across a total area of about , Guangdong is the most populous province of China and the 15th-largest by area as well as the second-most populous country subdivision in the world (after Uttar Pradesh in India).
The province of 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 126,012,510 in the 2020 Chinese census, accounting for 8.93 percent of mainland China's population. This makes it the most populous first-level administrative subdivision of any country outside of South Asia. The vast majority of the historical Guangdong Province is administered by the People's Republic of China (PRC). Pratas Island in the South China Sea is part of Cijin District, Kaohsiung, Taiwan (ROC); the island was previously part of Guangdong Province before the Chinese Civil War.
Guangdong's economy is currently the largest of any provincial-level division in China, with a GDP of 12.9 trillion RMB ($1.7 trillion in GDP nominal) in 2022, contributing approximately 10.6% of the total economic output of mainland China. It has a diversified economy, and was known as the starting point of the Maritime Silk Road of ancient China. It is home to the production facilities and offices of a wide-ranging set of Chinese and foreign corporations. Guangdong has benefited from its proximity to the financial hub of Hong Kong, which it borders to the south. Guangdong also hosts the largest import and export fair in China, the Canton Fair, hosted in the provincial capital of Guangzhou. The Pearl River Delta Economic Zone, a Chinese megalopolis, is a core for high technology, manufacturing and foreign trade.