River Mouth is a type of Terrain in the world of Master of Magic. River Mouth tiles appear wherever a River connects to the Shore of an ocean or inland lake. Therefore, they will only be found along shorelines, and always have at least one River extending in the opposite direction, heading inland. River Mouths are always devoid of Minerals and will never contain Encounter zones either. Furthermore, they may not be affected by any spell that alters the landscape, such as File:Icon Nature.pngChange Terrain, or File:Icon Chaos.pngRaise Volcano.