(also spelled Macau, 澳門, Oumùhn in Cantonese, Àomén in Mandarin) is a Special Administrative Region (SAR) of China and one of the world's most densely populated spots. Located across the Pearl River estuary from Hong Kong, Macau was a colony and later overseas territory of Portugal until 1999.
Macau is best known as a major destination for gambling. This goes back to colonial times, when Hong Kong had tight limits on gambling — it was legal only at the horse racing track twice a week — but Macau had casinos. Macau overtook Las Vegas as the world's highest revenue gambling destination around 2008 and now has a substantial lead; several of the major Las Vegas casinos have built new establishments in Macau to cash in on the trend.
Macau is by no means only a gambling destination and other attractions include gorgeous colonial architecture, some of it on the UNESCO World Heritage List, a lovely climate and some fine beaches, and excellent food and drink.