One of the terms in orienteering/navigation is "handrail feature".
What exactly does this term mean?
A handrail feature is something that you can travel paralleled to in order to reach your destination.
A good example of this would be a stream/river as while you wouldn't want to follow directly beside it due to any swamps/marshes/beaver dams or trying to follow the bends, staying parallel to it, would help prevent you from getting lost.
A few other examples would be long ridges, trails, roads, and valleys.