Kyushu's smallest prefecture, Saga is located on the northwest corner of the island, bordered by the Genkai Sea and the Tsushima Strait to the north and the Ariake Sea to the south.
On October 1, 2005, the towns of Morodomi, Yamato and Fuji (all from Saga District) and the village of Mitsuse from Kanzaki District merged with the city of Saga to form the new city of Saga.
The city of Saga is scheduled to merge with the remaining parts of the Saga District on October 1, 2007.