From the introduction: On the fringes of civilized space lie the Border Planets: untamed frontiers rich with strange minerals and populated by rubes and monsters. Best-known of the Border Planets is Pandora, the world of convicts and cannibals. It became a hotbed of action as the corporations wrestled for control of its resources and the alien power of the Vaults. There are other planets and other Vaults, but in the narrative of the Borderlands series, Pandora is the focus.