Moon Valleys are a type of feature found on the surface of the moon. They are created by the erosion of the lunar surface due to impacts from meteorites and other objects. RILLS are shallow, narrow valleys that are typically found on the moon's surface and are usually less than a few kilometers in length. Rilles are deeper and wider than RILLS and can be up to several hundred kilometers in length. Both RILLS and rilles are important features of the lunar landscape and provide insight into the history of the moon's formation.