evidence: The Okpara River is a river of Benin.[2] Originating in Borgou Department, it flows south and becomes the border between Nigeria and Benin before re-entering Benin and flowing into the Ouémé River, which ultimately drains into the Atlantic Ocean.[3] Several villages along the river are disputed between Benin and Nigeria.[4][5] Report says that the Okpara River heavily contaminated by toxic metals.[6] Okpara River is a stream in Nigeria. It is located at an elevation of 75 meters above sea level. It has coordinates of 7°45'0" N and 2°28'60" E in DMS or 7.75 and 2.48333. The sun rises at 08:45 and sets at 20:52 local time (Africa/Lagos UTC/GMT+1). It is a Stream body of running water moving to a lower level in a channel on land.[7]