The river then passes the Aboriginal communities of Marrkalawa and Andanangki the past the Coast Range and discharges into Blue Mud Bay and the Gulf of Carpentaria and the Arafura Sea.

[3] The estuary formed at the river mouth is in near pristine condition with a tidal delta.

[4] The estuary at the river mouth occupies an area of 29.5 hectares (73 acres) of open water.

The river was named by the explorer, David Lindsay, during his expedition through Arnhem Land in 1883.

Lindsay named it after Thomas Walker, the leader of the Blue Mud Bay prospecting party, who was murdered by Aboriginal people in the area in 1875.