Reef City is a large, spectacular city that has been built on several small islands and in some areas on top of the water itself. The city's structures were initially made of coral and limestone, but as time moved on more expensive building materials became available. It is the third largest city in the world, behind Omashu, and the second richest behind the Fire Nation Capital. It has been dubbed the "Reef that Never Sleeps" because the constant influx of trading ships, excited tourists, and a zealous nightlife.
