Macau is a small city in the southern coast in China and is one of the two Special Administrative Regions in China. (The other one is Hong Kong). It consists of the Macau Peninsula, Taipa Island, Coloane Island and Cotai, the newly reclaimed land between Taipa and Coloane. Here's the map.
Information about diving in Macau is scant (to say the least!) so, if you have anything you can contribute, please contact us.