The book comprises 51 two-colour maps (a general map of Middle-earth and 50 numbered maps) at various scales, all based on the original The Lord of the Rings maps drawn by Christopher Tolkien from his father's sketches. Each map is on a right-hand page in landscape format and depicts physical features in black and contour lines in red. Routes taken by characters on roads and paths are shown in dashed black and red; routes off-road are in red only. Arrows show the direction of travel and dates are listed in red. Scales along the top and left of each map show the distance east/west (mainly east) and north/south (mainly south) from Bag End. At the bottom of each map is a scale showing miles to the inch and an indication of the Lunar phase or phases visible at the dates given.
Each numbered map is accompanied by a description on the facing left-hand page, in which Strachey describes the portion of the route indicated, often justifying her topographical decisions with quotes from the book. In some cases she points out discrepancies in the topographical descriptions, occasionally for instance altering the course of a road or a river on the grounds that it would otherwise be inconsistent with Tolkien's other descriptions of the terrain.
Christopher Tolkien refers to Journeys of Frodo a number of times in The History of The Lord of the Rings, often agreeing with Strachey's conclusions, and sometimes disagreeing.