Proto-Altaic: *i̯ū́ńa ( ~ -u, -e)
Meaning: pit, ravine
Russian meaning: яма, овраг
Comments: A Western isogloss. It is somewhat difficult to distinguish PA *i̯ū́ńa 'pit, ravine', *i̯ŭ́ne 'notch (on arrow)' and *i̯ańu 'line, furrow' because of natural contaminations, but such a distinction seems necessary.