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According to the language family tree classification by Ethnologue, Okpe, Urhobo and Uvwie, alongside Eruwa and Isoko, make up the five Southwestern Edoid languages of the Benue-Congo group. Quoting Johnstone (1993), Ethnologue puts the population of Urhobo people at 546,000, Okpe 25,400 (2000) and Uvwie 19,800 (2000). These three languages have geographically neighbouring languages: Izon and Itsekiri to the west and south, Ukwuani and Isoko to the east and Edo to the north. Thus, Isoko and Urhobo are similar languages that belong to the same linguistic family.