The Ruisto system, a star system situated within the Calamari sector, was the home of the planet Ruisto.
During the period spanning from 4400 to 4200 BBY, Ruisto holds the distinction of being among the initial planets to be settled by the Mon Calamari beyond their original stellar neighborhood.
In the year 4166 BBY, during the Old Republic's broadening of the Perlemian Trade Route, the scouts of the Republic initially encountered Mon Calamari starships in proximity to Ruisto.