Vanishing Point; "The point at which parallel lines appear to converge". The vanishing point is a tool used a lot by scenic photographers and architectural photographers. It is a good way to show perspective in a big, sweeping landscape or cityscape when the photographer really wants the viewer to understand the scale of the place he or she is photographing. But you don't need perfect lines to achieve this effect - it can also be done with a series of regular-sized objects such as trees in an orchard. A vanishing point can even be implied with a shadow in front of a back-lit subject.
So, be creative in your approach.