Seoul 5
this ancient world was once the homeworld of the Seoulian race. It was believed that much of the planet had been destroyed by a biochemical weapon during a war many millennia before the Galactic Civil War. However, the Empire discovered the planet and established a base there, during the years leading up to the Battle of Endor. The base was eventually discovered by Han Solo, who obtained the coordinates of Seoul 5 while gambling with a former Imperial scout.