The Boiling Sea is a location in Wonderland, which is featured on ABC's Once Upon a Time in Wonderland.
The Boiling Sea is, as the name suggests, an ocean that is boiling hot and enough to kill somebody if they fell in. There is a cliff overlooking the Boiling Sea, and floating islands above it.
- The Boiling Sea is a reference to a line in the poem The Walrus and the Carpenter, "And why the sea is boiling hot..." which is recited by Tweedledee and Tweedledum in the story Through the Looking-Glass.
- W, E01: "Down the Rabbit Hole"