<P> The river loses nearly two - thirds of its potential flow in the Inner Delta between Ségou and Timbuktu to seepage and evaporation . All the water from the Bani River , which flows into the Delta at Mopti , does not compensate for the ' losses ' . The average ' loss ' is estimated at 31 km / year , but varies considerably between years . The river is then joined by various tributaries , but also loses more water to evaporation . The quantity of water entering Nigeria measured in Yola was estimated at 25 km / year before the 1980s and at 13.5 km / year during the 1980s . The most important tributary of the Niger in Nigeria is the Benue River which merges with the river at Lokoja in Nigeria . The total volume of tributaries in Nigeria is six times higher than the inflow into Nigeria , with a flow near the mouth of the river standing at 177.0 km / year before the 1980s and 147.3 km / year during the 1980s . </P>
<P> The river loses nearly two - thirds of its potential flow in the Inner Delta between Ségou and Timbuktu to seepage and evaporation . All the water from the Bani River , which flows into the Delta at Mopti , does not compensate for the ' losses ' . The average ' loss ' is estimated at 31 km / year , but varies considerably between years . The river is then joined by various tributaries , but also loses more water to evaporation . The quantity of water entering Nigeria measured in Yola was estimated at 25 km / year before the 1980s and at 13.5 km / year during the 1980s . The most important tributary of the Niger in Nigeria is the Benue River which merges with the river at Lokoja in Nigeria . The total volume of tributaries in Nigeria is six times higher than the inflow into Nigeria , with a flow near the mouth of the river standing at 177.0 km / year before the 1980s and 147.3 km / year during the 1980s . </P>
where did river niger and river benue meet
where did river niger and river benue meet
at Lokoja in Nigeria
at Lokoja in Nigeria