Itsukushima is an island in the western part of the Inland Sea of Japan, located in the northwest of Hiroshima Bay. It is popularly known as Miyajima, the Shrine Island. The island is one of Hayashi Razan's Three Views of Japan. Itsukushima is part of the city of Hatsukaichi in Hiroshima Prefecture. The island was the town of Miyajima before the 2005 merger with Hatsukaichi.
Itsukushima is famous for the Itsukushima Shrine, a UNESCO World Heritage Site. According to records, the shrine was established in the time of Empress Suiko. The warrior-courtier Taira no Kiyomori gave the shrine its present form. In 1555, Mōri Motonari defeated Sue Harukata at the Battle of Miyajima. Toyotomi Hideyoshi built a large building, the Senjō-kaku, on a hill above the shrine.[Source]