The Mysterious Cities of Gold, originally released in Japan as Esteban, Child of the Sun (Japanese: 太陽の子エステバン, Hepburn: Taiyō no Ko Esuteban) and in France as Les Mystérieuses Cités d'Or, is a French-Japanese animated series co-produced by DiC Audiovisuel and Studio Pierrot.Set in 1532, the series follows the adventures of a young Spanish boy named Esteban who joins a voyage to the New World in search of the lost Seven Cities of Gold and his father.
The series was originally broadcast in Japan and the French version, edited to have different characterization and music, was subsequently redubbed and distributed in many different countries throughout the world. It is currently licensed for English-language home video release in the United Kingdom, Australia, and North America by Fabulous Films.