The Lower Sepik starts at Tambanum and runs down to the coast. Angoram is the most important settlement on the Sepik. The Marienberg Mission station, which has been operated by the Catholics for many years, is about two hours downstream from Angoram.
Near the mouth of the river, the Murik Lakes are vast semi-flooded swamplands, narrowly separated from the coast. Villages along this part of the Sepik are smaller, poorer and generally have had less Western contact than many in the Middle Sepik.
The vast volume of water and silt coming down means that the landscape around the mouth of the Sepik changes rapidly. Many villages here are only a few generations old, built on new land.