town of Yuda. (3 towns, 2 villages) April 1, 1991 - The towns of Waga and the village of Ezuriko merged with the city of Kitakami. (2 towns, 1 village) November 1, 2005 - The town of Yuda and village of Sawauchi merged to form the town of Nishiwaga. (2 town) January 1, 2006 - The town of Tōwa merged with the towns of Ishidoriya and Ōhasama from Hienuki District with the city of Hanamaki. (1 town) Waga Districts in Iwate Prefecture