Starbase Expanse 4 was a Federation deep space station and planet-based starbase based on the planet Krakania on the edge of the Typhon Expanse. Starbase Expanse 4 had both an orbital platform to repair, replenish and assist starships and a planet-based city on its surface. Starbase Expanse 4 was originally a Federation colony. One of its founders was Ambrose Wong's grandfather. Incidentally, he was the one who discovered the extensive cave systems on Krakania and the Krakanian wall paintings. He also named the colorful purple light emanating from the caves "Peking Purple".