It is spoken in Iyomempwi (4°14′28″S 141°53′34″E / 4.24117°S 141.89271°E / -4.24117; 141.89271 (Imombi)), Mowi (4°17′42″S 141°55′45″E / 4.294971°S 141.929199°E / -4.294971; 141.929199 (Mowi)), and Premai villages of Tunap/Hunstein Rural LLG in East Sepik Province, and other villages on the May River.
[1][2] In non-final positions, /u/ /o/, /i/, and /e/ are [ʊ] [ɔ], [ɪ], and [ɛ], respectively.
[3] May River Iwam pronouns:[4]: 282 Like the Wogamus languages, May River Iwam has five noun classes:[4] As shown by the example above for ana ‘hand’, a noun can take on different classes depending on the physical characteristics being emphasized.
May river Iwam has four periodic tense suffixes: matutinal -yok, diurnal -harok, postmeridial -tep and nocturnal -wae.
[5] The following basic vocabulary words of Iwam are from Foley (2005)[6] and Laycock (1968),[7] as cited in the Trans-New Guinea database:[8]