The Sea Witches are the daughters and nieces of Ursula and Morgana, the sea witches; they are the sisters and cousins of Uma though Ursula doesn't really care about Uma at all. They are introduced in The Isle of the Lost.
The Sea Witches appear only in the first novel. They are mentioned leaning over their violins preparing for the Autumn Concert at Dragon Hall.
- They were introduced in Chapter 2, 'A Wily Thief...' of The Isle of the Lost.
- They play violins in the Junior Orchestra at Dragon Hall.