As a tidal estuary (also called Port Loko Creek) it combines with the Rokel River to the south to form the Sierra Leone River.

The Bankasoka is a coastal river that, together with the Rokel River, forms the Sierra Leone River estuary about 40 kilometres off the Atlantic Ocean.

Its northern part is also known as Tumbu-See English Tumbu Lake ).

There are three small hydroelectric power stations near Port Loko.

This article related to a river in Sierra Leone is a stub.