 Certain nouns, primarily those referring to geography, can also form a locative ending in "-um" in the singular and the resulting forms serve as adverbials.These forms are generally not productive, but in the Neo-Babylonian the "um"-locative replaces several constructions with the preposition "ina".In the later stages of Akkadian the mimation (word-final "-m") - along with nunation (dual final "-n") - that occurred at the end of most case endings disappeared, except in the locative.