Why would walking around the equator of Mars be considered a mountaineering operation?

Large obstacles like Valles Marineris and Olympus Mons disrupt the path

While a theoretical calculation for walking the circumference of Mars suggests a specific distance and time, the reality of the terrain makes such an expedition impossible as a simple walk. Massive geographic features, such as the canyon system of Valles Marineris which dwarfs the Grand Canyon, and giant volcanoes like Olympus Mons, turn any attempt at long-distance traversal into a complex mountaineering challenge rather than a straightforward hike.