This book consists of articles from Wikia or other free sources online

Chapters: Books, Characters, Clothes, Creatures, Current mermaids, H20 just add water episodes, Humans, Mermaids, Mermaid helpers, Mermaid powers, Mermaid reasearcher, Past mermaids, Places, Secret keepers, Angela Sertori, Annette Watsford, Ash Dove, Bella Hartley, Bev Sertori, Byron, Charlotte Watsford, Cleo Sertori, Dr. Linda Denman, Elliot Gilbert, Emma Gilbert, Eva, Gracie Watsford, Harrison Bennett, Hector, Hotstuff, Julia Dove, Karl, Kim Sertori, Laurie, Lewis McCartney, Louise Chatham, Max Hamilton, Miriam Kent, Mitch, Mrs Geddes, Nate, Rikki Chadwick, Ronnie, Ryan Tate, Samantha Roberts-Sertori, Sophie Benjamin, The Gilbert Family, The Sertori Family, Tiffany, Water Tentacle, Wilfred, Will Benjamin, Zac, Zane Bennett, Swimwear, Characters, Hector, Hotstuff, Ronnie, Water Tentacle, Bella Hartley, Characters, Cleo Sertori, Emma Gilbert, Mermaid, Rikki Chadwick, Zac, Season 1, Season 2, Season 3, Angela Sertori, Annette Watsford, Ash Dove, Bella Hartley, Bev Sertori, Byron, Characters, Charlotte Watsford, Cleo Sertori, Dr. Linda Denman, Elliot Gilbert, Emma Gilbert, Eva, Gracie Watsford, Harrison Bennett, Julia Dove, Karl, Kim Sertori, Laurie, Lewis McCartney, Louise Chatham, Max Hamilton, Miriam Kent, Mitch, Mrs Geddes, Nate, Rikki Chadwick, Ryan Tate, Samantha Roberts-Sertori, Sophie Benjamin, The Gilbert Family, The Sertori Family, Wilfred, Will Benjamin, Zane Bennett, Aerokinesis, Bella-Will Relationship, Bella and Nate's Band, Characters, Charlotte-Lewis Relationship, Cleo's Diary, Cleo-Lewis Relationship, Combined Atmokinesis, Comet Eva, Cryokinesis, Crystal Necklaces, Electrokinesis, Emma-Ash Relationship, Gracie and Cleo's Locket, H2O wiki Rules for editing, Hydro-Thermokinesis, Hydrokinesis, Julia and Rikki's Locket, Lockets, Louise and Emma's Locket, Mako Island, Mermaid, Mermaid Mythology, Mermaid Powers, Past Mermaids, Pyrokinesis, Rikki's Cafe, Rikki-Zane...