Extraordinary private cruises around the Seto Inland Sea The Seto Inland Sea is Japan's largest archipelago, consisting of over 700 islands. One of Japan's first national parks, this region is renowned for its stunning scenery. It is home to many must-see spots in Japan including UNESCO World Heritage Site "Miyajima", modern art haven "Naoshima", and "Shimanami Kaido", one of the world's premier c