Magical Water Plants of the Highland Lochs is a book mentioned by Harry in the Harry Potter and the Goblet of Fire (film). It is the book that Moody gave Neville Longbottom when they had tea. It is obviously about magical water plants of the highland lochs and helps Neville get the Gillyweed for Harry in the film.
Behind the Scenes
The book is only mentioned in Harry Potter and the Goblet of Fire (film), and does not appear in the books.