A nation that is the home of both Genshu and Hazuki. The country actually has a different (official) name but Genshu mentions that most people simply call it 'Katana' due to its reputation for sharp blades. The country's leadership is said to be highly trained in fencing and other forms of swordsmanship.
Judging by Genshu's sword-handling, iaido-jutsu is one such form of swordsmanship practiced in Katana. Perhaps Georg Prime picked it up here before venturing to Falena. Judging on how he fought in Suikoden V.