Mainland/Mamose Region, Papua New Guinea
This diverse region, with its vast rivers, coral reefs and World War II relics, incorporates East Sepik, Sandaun, Madang and Morobe provinces. The mighty Sepik River – one of the world’s great waterways – runs through East Sepik Province, and there is excellent diving off the coastal areas of Madang and Morobe. Sandaun province, which shares a border with Indonesia, remains relatively undeveloped, with lovely beaches and picturesque villages.