guidebook also includes some great variant routes, such as the stunning GR55 through the Vanoise National Park and the GR52 through the Mercantour National Park to finish at Menton. Every section of route description is illustrated with clear colour mapping and gradient profiles, as well as inspirational photographs. The GTA trek is achievable by any fit and experienced walker and this guidebook suggests daily stages, timings, ascents and descents, and lists all the facilities and services available along the way from start to finish. People have been crossing the Alps for many centuries but today's journey is much easier than that of those who have gone before. With some advance thought and planning, coupled with a willingness to adapt your plans day-by-day if necessary, a walk along the GR5 should present a fine and memorable challenge.