Moana lives on the island of Motunui with her family. Together they are happy on the island, just like the rest of the islanders. However, Moana wishes to journey beyond the reef, but her father forbids her to because of what happened when he tried to journey beyond the reef.
Moana's grandmother tells her that if the voice inside is telling her to set sail, and if the voice starts to whisper, then that is who she is. She also shows her that her ancestors were voyagers. Thus, she tells everyone about this discovery and that her people can voyage again, because their island is slowly dying due to Maui taking the heart of Te Fiti long ago. At first her father does not like this, but after Moana's grandmother becomes ill, they allow her to go find Maui and tell him that he needs to restore the heart to Te Fiti.
Moana goes on a long journey to find Maui, and eventually he agrees to go with her to Te Fiti to restore the heart. They overcome obstacles along the way. Finally, they restore the heart to Te Fiti and all is well again.