It flows from south to north, passing Batu Lanteh at upriver and the city of Sumbawa Besar at downriver, into the Flores Sea.

[3] For years, the Brang Biji River suffers from rapid sedimentation, which reduces its water capacity, and decreasing width due to uncontrolled house building along the river banks.

[4] These factors contribute to annual flood, submerging houses along the banks in the districts of Bugis, Brang Bara, Pekat, Samapuin, Lempeh and Brang Biji,[3] as happened in February 2017.

[5] The Brang Biji River is also heavily polluted by high concentrations of E-coli and mercury, reaching unsafe levels for people to use for drinking or washing.

[6] The pollution is attributed to the unhygienic lifestyle of the community, such as throwing thrash and using the river as a restroom.