 These waterways flow from the mountainous interior which is formed through the conglomeration of the Rawlinson Range in the south, with the Cromwell Mountains in the east.These meet in the centre of the peninsula to form the Saruwaged Range massif, which joins the Finisterre Range further west.Apart from a thin, flat coastal strip, at the time of the campaign, the area was thickly covered with dense jungle, through which very few tracks had been cut.