Macau (also spelled Macao) is a Special Administrative Region (SAR) of China located on the southern coast of China in the Pearl River Delta. It lies on the western bank of the Pearl River estuary, about 60 kilometers (37 miles) west of Hong Kong and roughly 145 kilometers (90 miles) southwest of Guangzhou, the capital of Guangdong Province. Macau consists of the Macau Peninsula and the islands of Taipa and Coloane, which are connected by land reclamation known as Cotai. It borders the city of Zhuhai in mainland China and has a coastline along the South China Sea.
Macau was formerly a Portuguese colony and became a Special Administrative Region of China in 1999, operating under the principle of "one country, two systems," which grants it a high degree of autonomy from mainland China.
In summary, Macau is a small, dense, and historically rich region located on the southern coast of China near Hong Kong and Guangdong Province.