ORLANDO -- The new Fantasyland at Walt Disney World officially opened Thursday in the Magic Kingdom.

The expansion includes more Disney characters and two new themed areas: Enchanted Forest and Storybook Circus.

Photos: Inside Disney World's new Fantasyland

Guests can ride "Under the Sea" in the journey of the "Little Mermaid" or learn more about "Belle" from "Beauty and the Beast" and eat in the Beast's Castle.

The $425 million expansion is the largest in the Magic Kingdom's history.

It's nearly double the size of the original Fantasyland.