This book is what I would call a classic companion to any reading of Tolkien's The Lord of the Rings. It is not a recent publication (dating from 1981) but, I think, has retained its timeless value and appeal. I first read it in the 1980s and have now just read it again as I complete a fresh reading of The Return of the King. I love it.
It highlights the extraordinary detail that Tolkien put into creating the world of Middle Earth, showing how everything from distances covered, dates of travel, contours and elevations, forests, rivers and mountains, through to the phases of the moon were given careful consideration by Tolkien to sustain a level of textual integrity and detailed coherence which I find unrivalled in the creation of fictional worlds. It provides a bird's eye view of the journey the reader takes with Frodo and others in the epic novels. A note of caution, however: it does contain plot spoilers, so I would recommend its use for your second or subsequent reading of the novels.
It is rightly called Journeys of Frodo with the reference to being an 'atlas' in the subtitle, since it is very much focused on that hobbit's travels (plus that of some of his companions). It does include some reflections on the Tolkien's text throughout, highlighting the very small number of textual difficulties the cartographic author had with transferring the story to maps. They are beautifully hand-drawn and complement the classic style of Christopher Tolkien in the maps he provided for his father's novels.
An essential title in your Tolkien reference library!