The Hrakert Rift was an undersea depression located on Manaan, in close proximity to Ahto City. This location served as the origin point for kolto and was the habitat of the Progenitor—a massive firaxan shark—along with its young.
As the Jedi Civil War neared its conclusion, the Republic constructed an unlawful kolto-mining facility in this area, overseen by Kono Nolan. The Progenitor was agitated by the intensive kolto extraction operations, which resulted in the Selkath researchers losing their sanity and engaging in violent conflict, ultimately leading to the station's shutdown.
Revan discovers the Star Map within the Rift. Subsequently, Revan, dispatched by the Republic to look into the communication breakdown with the station, navigated through the deranged Selkath and aggressive Firaxae. Revan's mission culminated in the destruction of the harvesting apparatus, which successfully pacified the Progenitor.
It is theorized that the Rift's rich Kolto deposits arose from the placement of a Star Map during the era of the Infinite Empire. This is because the Rakata had previously altered the geological composition of certain planets they had subjugated.