Under the Sparkling Sea Book
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When Twilight Sparkle receives an invitation to visit the underwater city of Aquastria, she invites all her pony friends and Spike to travel with her. The ponies are welcomed by the ruler of Aquastria, King Leo, who sits on the Cosmic Council alongside his cousin, Princess Celestia, and they learn of the long-held rivalry between the seaponies and the mermares. The two groups compete each year in a race for the grand prize, which is a beautiful pearl. Join the adventure as the ponies and Spike navigate the oceanic world, confront danger, make new friends and race to the finish in this shimmering new world!