Hallucinatory terrain

Hallucinatory terrain is an illusion spell that makes one type of terrain look like another.

Effect
You make natural terrain look, sound, and smell like some other sort of natural terrain. Thus, open fields or a road can be made to resemble a swamp, hill, crevasse, or some other difficult or impassable terrain. A pond can be made to seem like a grassy meadow, a precipice like a gentle slope, or a rock-strewn gully like a wide and smooth road. Structures, equipment, and creatures within the area are not hidden or changed in appearance.

Material components
A stone, a twig, and a bit of green plant.