was a province of ancient Japan in the area that is today the eastern part of Yamaguchi Prefecture. Suà  bordered on Aki, Iwami, and Nagato Provinces.
Its abbreviated form name was . In terms of the Gokishichidà  system, Suà  was one of the provinces of the San'yà Âdà  circuit. Under the Engishiki classification system, Suà  was ranked as one of the "superior countries" (ä¸Âå½) in terms of importance, and one of the "far countries" (é å½) in terms of distance from the imperial capital, Kyoto. The provincial capital was located in what is now the city of Hà Âfu, Yamaguchi. The ichinomiya of the province is the Tamanooya Shrine also located in Hà Âfu.
Before the establishment of the Ritsuryà  system, the area of Suà  was under control of various semi-independent kuni no miyatsuko: à Âshima Kuni (Suà Â-à Âshima), Suà  Kuni (Kumage County, Kuga County), Hakuki Kuni (Kishiki County), Tsunu Kuni (Tono County), and Sawa Kuni (Sawa County) . These were united to form the Ritsuryo province, which initially consisted of five counties: Oshima, Kumage, Tsuno, Sawa, and Kisiki. Kuga County was divided from Kumage in 721 to form the sixth counties. In the Asuka period, the Iwakisan Kà Âgoishi mountain fortification was constructed against a possible invasion by Tang dynasty China and the Kingdom of Silla in Korean peninsula. Wooden tally strips bearing the name of 'Suho Province', 'Shuyà  Province' and 'Suà  Province' have been found at the ruins of Fujiwara-kyà  and Heijà Â-kyà  and the names were used interchangeably in Nara period records, such as the Nihon Shoki.
During the Kamakura period, the ruling Hà Âjà  clan were the shugo of the province, and were replaced in the Muromachi period by the à Âuchi clan. During the Sengoku period, the Mà Âri clan supplanted the à Âuchi, and the province became part of the holdings of Chà Âshà « Domain in the Edo Period. Following the Meiji restoration, the province became part of Yamaguchi Prefecture. The area of former Suo Province is now divided between the cities of Hà Âfu, Kudamatsu, Iwakuni, Hikari, Yanai, Shà «nan, à Âshima District, Kuga District, Kumage District, and most of Yamaguchi city (excluding the former Ato Town), and a portion of Ube.
Following the Meiji restoration, Suà  was divided into six districts. Per the early Meiji period , an official government assessment of the nationâÂÂs resources, the province had 295 villages with a total kokudaka of 548,861 koku.