was a town located in Yamagata District, Hiroshima Prefecture, Japan.
As of 2003, the town had an estimated population of 3,711 and a density of 41.01 persons per km<sup>2</sup>. The total area was 90.50 km<sup>2</sup>.
On February 1, 2005, Ōasa, along with the towns of Chiyoda, Geihoku and Toyohira (all from Yamagata District), was merged to create the town of Kitahiroshima.
External links
- Official website of Kitahiroshima in Japanese