Langdam Key, situated on the planet Kwenn, was an island belonging to the Gem Cities of Kwenn's Middle Chain. The island featured the Harbor Market, a destination for high-end retail that included the Tasty Comet dessert and upscale clothiers. Furthermore, Langdam Key provided a docking location for the casino sail barge named Pelagic, and was linked via bridges to Brazatta, Kinnawah Key, and Quarney Keys.