Okpara River
The Okpara River is a river of Benin. 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. Several villages along the river are disputed between Benin and Nigeria. Pollution 
Report says that the Okpara River heavily contaminated by toxic metals. Climate 
Okpara River is a stream in Nigeria. It is located at an elevation of 75 meters above sea level. It has cordinates 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. References

Rivers of Benin
Rivers of Nigeria
Benin–Nigeria border