The World of Ice and Fire (US, UK) is a source book for A Song of Ice and Fire. Joining Mr. Martin in creating this work are Elio M. García, Jr. and Linda Antonsson (the founders and maintainers of Westeros.org). The book is lavishly illustrated, in-depth guide to the history, geography, cultures, religions, and characters featured in the series.
It was published on October 28, 2014.