is a district divided between Iburi and Kamikawa Subprefectures in Hokkaido, Japan. Towns and villages Iburi Subprefecture Abira (merger of Hayakita and Oiwake) Atsuma Mukawa Kamikawa Subprefecture Shimukappu History 1869 - With the establishment of provinces and districts in Hokkaido, Yūfutsu District, Iburi Province is created 1897 - Placed under Muroran Subprefecture (later renamed Iburi) 1906 - Shimukappu Village transferred to Kamikawa Subprefecture 1948 - Tomakomai City established, leaving Yūfutsu District On March 27, 2006 - the towns of Hayakita and Oiwake merged to form the new town of Abira. On March 27, 2006 - the towns of Hobetsu and Mukawa merged to form the new town of Mukawa, now with a different writing. Districts in Hokkaido