In L. Frank Baum's The Wonderful Wizard of Oz, the Wizard lives in the Emerald City. It is the capital of the Land of Oz and the destination Dorothy Gale and her companions reach by following the Yellow Brick Road.
The city is famous for its green architecture and glittering appearance. However, Baum's story reveals that the Wizard has made citizens and visitors wear green spectacles, creating the impression that everything is made of emeralds. The Wizard himself is not a supernatural being but an ordinary man from Omaha who arrived in Oz by balloon.
The Emerald City is often confused with Oz itself, but Oz is the entire magical country, while the city is its capital. Munchkinland is another region of Oz, and the Yellow Brick Road is a route, not a place where the Wizard lives. The city first appeared in Baum's 1900 novel and became one of fantasy literature's most recognizable settings.