The Little Mermaid II: Return to the Sea

The Little Mermaid II Return to the Sea is a 2000 Disney animated feature film and directtovideo sequel to the 1989 animated film The Little Mermaid. Directed by Jim Kammerud and Brian Smith, the story takes place over a decade after the original film, and focuses on Ariel and Erics daughter Melody, a human princess who longs to swim in the ocean despite her parents law that the sea is forbidden to her. This sequel stars the voices of Jodi Benson as Ariel, Tara Charendoff as Melody and Pat Carroll as Morgana, the films new villain. It is the last film in the chronology of Walt Disneys version of The Little Mermaid. Its followed by a prequel, The Little Mermaid Ariels Beginning, a 2008 directtovideo animated feature.

Fearing Morgana and remembering Ursula, Ariel decides to withhold all knowledge of the sea world from Melody. The locket is tossed into the ocean, and a massive wall is built to separate the royal castle from the sea.Twelve years later, Melody remains unaware of her mothers mermaid heritage and is forbidden from ever going into the sea. However, she has been sneaking out of the castle regularly to swim and one day finds her locket. Seeing her name on the locket, Melody confronts her mother and, frustrated with her mothers refusal to answer her questions, Melody takes a boat and sails away from home. Her parents soon learn that she is gone, and Triton uses his magic to transform Ariel back into a mermaid to search for Melody. ........

Source: Wikipedia