Tangrene
this planet was the site of an Imperial Intelligence Ubiqtorate center that was destroyed by Garm Bel Iblis and his freelance militia during the height of the Galactic Civil War. It was being rebuilt at the time Grand Admiral Thrawn re-appeared some five years after the Battle of Endor, and had a Crystal Gravfield Trap operating at the new base. Tangrene was a mountainous world of craggy peaks and deep canyons, and was virtually barren of vegetation and surface water. A race of sentients once lived on the planet, but the Empire enslaved them during the construction of its garrison there. The Moff in charge of the sector decided that the natives would be more of a liability than an asset, and exterminated them before they could pose any threat. The average day on Tangrene lasts 29 standard hours, and its year encompasses 356 local days.