Doraemon Movie 21: Nobita no Taiyou Ou Densetsu
English name: Doraemon the Movie: Nobita's the Legend of the Sun King
Genres: Adventure, Comedy, Fantasy
Type: Movie, Episodes: 1
Aired: Mar 4, 2000
Studio: Shin-Ei Animation
Source: Unknown
Rating: PG - Children
Synopsis:
Doraemon and its friends open a hole in the time and they're travel to the Country of Mayana, a lost Mayan civilization in the jungle. There, Nobita will know its perfect double, prince Thio, heir to the throne. Both will decide to interchange papers to try to save to the Country of Mayana of the claws of the infernal Ledina witch and her evil forces.

(Source: ANN)