Is a book on facts about drangons nonfiction or fiction?

A book on facts about dragons would be considered nonfiction, even though dragons are fictional creatures.

Here's why:

* The book is presenting information about a specific subject: The subject in this case is dragons, even if they aren't real.

* The information is presented as factual: The book would likely discuss various aspects of dragons as they exist in mythology, literature, and popular culture. This information is presented as factual within the context of those worlds.

* The book aims to inform the reader: The goal of the book is to educate the reader about dragons, their origins, their characteristics, and their significance in different cultures.

While dragons themselves are fictional, a book about them can be a valuable source of information about their representation in human culture and imagination.