Books About Underwater Worlds

The Best Underwater Worlds Books for Kids

Looking for excellent children's books about underwater worlds? This collection brings together Bookroo's highest-rated and most useful picks in one place.

Start with our editorial favorites, then browse recommendations organized by reading stage to find the right book for your reader.

The Shortlist

Our 10 Favorite Books About Underwater Worlds

Graphic Nov.

Sale price

$1398

Chapter Book · Ages 8–12 · 2024

Plain Jane and the Mermaid

By Vera Brosgol

Plain Jane's quest for independence leads her underwater to rescue a kidnapped prince from mermaids.

368 pages· 7,622 words· Est. 1.5 hour read

4.3/5 Goodreads · 5,285 ratings

$14.99Save 7%

Paperback

Summary: Jane, deemed plain by all, seeks independence by proposing to Prince Peter. But when a mermaid kidnaps him, her plans sink. Venturing into the ocean's depths, Jane faces enchanting mysteries and perilous creatures. Can she rescue her maybe-fiancé and find her own path to freedom? Dive into a tale where fairy-tale norms are turned upside down, and discover if Jane's courage can outshine her plainness.

Sale price

$1797

Picture Book · Ages 4–8 · 2023

Mermaid Day

By Diana Murray, Luke Flowers (Illustrator)

An underwater party invites all sea creatures, but is everyone truly welcome to celebrate Mermaid Day?

32 pages· 405 words· Est. 4 min read-aloud

4.0/5 Goodreads · 320 ratings

$18.99Save 5%

Hardcover

Summary: Dive into the enchanting world of Mermaid Day, where the mer-queen hosts a grand celebration in her underwater castle. As dolphins dance and narwhals play, the sea comes alive with joy. But beneath the waves, a question lingers: is every creature truly welcome to join the festivities? This heartwarming tale of inclusivity and fun invites young readers to explore a vibrant oceanic adventure, filled with colorful characters and a message of acceptance. Perfect for bedtime, this story promises a splash of magic and a gentle reminder of the power of belonging.

Sale price

$759

Chapter Book · Ages 10–14 · 2013

The Neptune Project

By Polly Holyoke · Book #1 in the The Neptune Trilogy series

Genetically altered teens must survive ocean perils and evade capture to find safety underwater.

352 pages· 75,783 words· Est. 8.5 hour read

4.3/5 Goodreads · 3,782 ratings

$7.99Save 5%

Paperback

Summary: Nere discovers she's part of a secret group of teens genetically modified to live underwater. As they flee a dystopian government, Nere and her companions must navigate treacherous seas, relying on dolphins and each other. With danger lurking in every wave, can they reach the Neptune colony before it's too late? Dive into a world of fierce battles and daring escapes in this thrilling aquatic adventure.

Sale price

$674

Chapter Book · Ages 6–9 · 2015

A Tale of Two Sisters

By Debbie Dadey, Tatevik Avakyan (Illustrator) · Book #10 in the Mermaid Tales series

A mermaid's discovery sparks sibling rivalry and a quest for harmony.

128 pages· 7,276 words· Est. 1.5 hour read

4.4/5 Goodreads · 138 ratings

$6.99Save 4%

Paperback

Summary: Echo, a curious mermaid, finds a mysterious human object, igniting a fierce rivalry with her sister, Crystal. As tensions rise, their mother intervenes, challenging them to learn cooperation. Will Echo reclaim her treasure and uncover its secrets, or will sibling strife prevail? Dive into this underwater adventure to find out!

Sale price

$674

Chapter Book · Ages 8–11 · 2012

Emily Windsnap and the Land of the Midnight Sun

By Liz Kessler, Natacha Ledwidge (Illustrator) · Book #5 in the Emily Windsnap series

A young mermaid and her friend embark on a secret mission to uncover the truth about the king of the oceans.

288 pages· 54,377 words· Est. 7.5 hour read

4.2/5 Goodreads · 3,614 ratings

$6.99Save 4%

Paperback

Summary: Emily and Aaron, half-mermaids, venture to the Land of the Midnight Sun, where an alpine lake reveals magical reflections and hidden truths. As they uncover stolen memories and Neptune's darkest secret, they face treacherous double-crosses. Will they navigate the icy dangers and unravel the mystery before it's too late?

Sale price

$674

Chapter Book · Ages 8–12 · 2018

Emily Windsnap and the Falls of Forgotten Island

By Liz Kessler, Erin Farley (Illustrator) · Book #7 in the Emily Windsnap series

A vacation turns into a quest to fulfill a prophecy and prevent disaster on a hidden island.

320 pages· 58,852 words· Est. 8 hour read

4.2/5 Goodreads · 1,547 ratings

$6.99Save 4%

Paperback

Summary: Emily Windsnap's vacation takes an unexpected turn when she and her boyfriend, Aaron, discover a hidden island beyond a powerful waterfall. The islanders believe in a prophecy that could save them from a looming earthquake, and it centers on Emily, Aaron, and a mythical giant. As time runs out, can they unravel the mystery and avert catastrophe?

Sale price

$1049

Chapter Book · Ages 10–14 · 2003

The Lost City of Faar

By D.J. MacHale · Pendragon series

A boy must save a water world from disaster and uncover a legendary land.

384 pages· 112,306 words· Est. 12.5 hour read

4.2/5 Goodreads · 32,747 ratings

$10.99Save 5%

Paperback

Summary: Bobby Pendragon, a fourteen-year-old thrust into interdimensional adventures, faces a new challenge on Cloral, a world of endless water. As floating cities teeter on the brink of war, Bobby must confront marauders and find the mythical land of Faar to prevent catastrophe. Can this suburban teen rise to the occasion and secure Cloral's future, or will the universe fall to chaos? Dive into a tale of courage, mystery, and the quest for survival.

Sale price

$1697

Picture Book · Ages 7–10 · 2020

The Haunted Lake

By P.J. Lynch

A man vanishes into a haunted lake, leaving love and hope afloat.

48 pages· 1,544 words· Est. 12 min read-aloud

4.2/5 Goodreads · 290 ratings

$17.99Save 6%

Hardcover

Summary: Jacob, bound to the haunted depths of Lake Spetzia, vanishes before marrying Ellen. As years pass, Ellen's unwavering hope flickers like her boat's light above. Can Jacob escape the watery spirits and reunite with her? Dive into a world where love battles the supernatural, and the past refuses to stay buried.

Sale price

$574

Chapter Book · Ages 6–9 · 2006

Rani in the Mermaid Lagoon

By Lisa Papademetriou, Judith H. Clarke (Illustrator) · Book #5 in the Tales of Pixie Hollow series

A wingless fairy seeks belonging among mermaids.

110 pages· 10,646 words· Est. 2 hour read

4.1/5 Goodreads · 4,022 ratings

$5.99Save 4%

Paperback

Summary: Rani, a wingless water-talent fairy, feels lost among her kind. Desperate for belonging, she embarks on a daring journey into the depths of the lagoon, where mermaids dwell. Will she find her true home and friends beneath the waves, or is her place still among the fairies she left behind? Dive into Rani's quest for identity and acceptance in a world where wings define worth.

Sale price

$1597

Picture Book · Ages 4–6 · 2016

The Big Book of Girl Power

By Julie Merberg · DC Super Heroes series

Discover how super heroines use their powers to inspire and protect.

32 pages· 165 words· Est. 2 min read-aloud

4.0/5 Goodreads · 115 ratings

$16.99Save 6%

Hardcover

Summary: Join Wonder Woman, Batgirl, Supergirl, and more as they showcase their unique powers and inspiring qualities. From truth-telling to technical prowess, these heroines teach young readers the value of courage, teamwork, and embracing differences. With classic DC art, explore their origin stories and see how they make the world safer. Can these super heroines inspire the next generation to overcome fears and unite for a better future?

The Bookroo Book Club