Castle's Chessboard

Fairy Tale Limerick 1 (Clue 1 of 5)

I was watching a segment on NPR (National Public Radio) called "Wait wait don't tell me" where they had a game that involved limericks as clues. I also recently joined: "Fairy Tale Princess Group"  and their prompts helped inspire the below challenge:

The following Limerick describes a Fairy Tale / Disney film. Are you able to figure out which one from the clue?

A mermaid whose love was on land,
asked a sea witch to give her a hand.
She made the hard choice
to give up her voice
for a chance just to walk on the sand.

Can you identify the Disney Film/Fairy Tale and the princess associated with it?

There will be 5 rounds of this. Each more challenging than the last... can you identify all 5? If you believe you know the answer to this once all 5 limericks are released... please e-mail them to me for a Bonus prize.

Also check later entries for additional clues. Good Luck!!