Abu (阿武郡, Abu-gun) is a district located in Yamaguchi Prefecture, Japan.
The town of Abu and the municipalities of Asahi, Fukue, Kawakami, Mutsumi, Susa, and Tamagawa along with the city of Hagi created the regional government to cover the region known as the Hagi Regional Municipal Government.
The town of Abu dropped out from the merger because of the indifferent relations with the city of Hagi.
[1] At one time, the town of Atō was scheduled to merge with the city of Yamaguchi, but failed to join the merger process.
However, on January 16, 2010, the town of Atō merged into the city of Yamaguchi.