Macau (/məˈkaʊ/; Chinese: 澳門), also spelled Macao, is one of the two special administrative regions of the People's Republic of China (PRC), the other being Hong Kong. Macau lies on the western side of the Pearl River Delta across from Hong Kong to the east, bordered by Guangdong province to the north and facing the South China Sea to the east and south. The territory's economy is heavily dependent on gambling and tourism, but also includes manufacturing.
A former Portuguese colony, Macau was administered by Portugal from the mid-16th century until 1999, when it was the last remaining European colony in China.
More information on the Wikipedia page