Sah Gosta was a settlement on the planet Argai in the Tion Cluster. When he visited Argai sometime during the Imperial Period, the historian and Ximologist Bleys Harand considered Sah Gosta largely unchanged since the days of Xim the Despot, over twenty-five thousand years earlier. Harand recorded his time in Sah Gosta in his travelogue Travels Amid Strange Stars.
Sources
Star Wars: The Essential Guide to Warfare Author's Cut, Part 3 — "Xim the Despot" on StarWars.com (article) (backup link) (First appearance)