Hado-misaki is a cape on the north side of Karatsu city, Saga Prefecture, Japan. It is the westernmost point of the island Kyūshū as well as the north-westernmost point of Japan's four main islands. There is a monument of the Northwest end of Japan and an observatory on the sea which can be seen islands of the Sea of Genkai from the observation deck. From the observatory, it can be look more than 30 kinds of fish swimming on the sea and seaweed and shells closer.