was a district located in Okayama Prefecture, Japan. As of 2003, the district had an estimated population of 39,365 and a density of 313.64 persons per km2. The total area was 125.51 km2. Towns and villages Oku Osafune Ushimado Merger On November 1, 2004 - the towns of Oku, Osafune and Ushimado were merged to create the city of Setouchi. Former districts of Okayama Prefecture