The Sepik is the longest river on the island of New Guinea. The majority of the river flows through the Papua New Guinea (PNG) provinces of Sandaun and East Sepik, with a small section flowing through the Indonesian province of Papua. The Sepik, pronounced "sea-pick", is one of the great river systems of the world. It has a large catchment area and landforms that include swamplands, tropical rainforests and mountains. Biologically, the river system is possibly the largest uncontaminated freshw… (More on Sepik)