Truk Lagoon, also known as Chuuk Lagoon, is a little over 1,100 miles north-east of New Guinea. This coral atoll is still in its coral formation stages; so many basalt islands remain above the lagoon’s surface. Outside the protective reef, there are over 30 coral sand islands. Truk is considered one of the top 10 diving sites in the world, so the scenery is ideal for diving. You can also explore the 50-feet deep wreckage of a sunken Japanese battleship, which is believed to house the remains of fighter aircraft, bulldozers and motorcycles.