A track cut down below the level of the surrounding fields. The cutting is due more to water erosion than to deliberate excavation. Some hollow-ways are ancient and are associated with Celtic fields, where they were used to mark the boundary between neighbouring estates, but many tracks are of fairly recent date.
There are many hollow-ways surviving in Buckinghamshire. Some are now the route of modern roads and some are associated with deserted settlement earthworks such as house platforms and fishponds. Some examples of hollow-ways are at Boarstall, Nup End in Wingrave and in Pulpit Wood.