For thousands of years, this fjord served as the hideout for pirates, bandits, the lair of harpies, dragons, and all manner of other creatures. In the Lith-Crillion Era, Varelay sent settlers to Hells Womb. Accustomed to jungle-like conditions, they were mostly yuan-ti with a handful of demon overseers. The latter never survived the voyage, each killed by the passengers and the crews of the ships; they hated Varelay and its demons. A small village grew up in the caves and crags of the area. By the Horgon Era, yuan-ti population had expanded across the Saknussem jungle. By the time of the Great Exodus, yuan-ti civilization in this area had declined to small clans, their once great cities abandoned. The Rat fjord, also give up, became a nesting area for predatory birds and dotted with pirate bases preying on the nascent empire of Kal-Oni, rising in the east.
After the Council of Bile came to power, the fjord was dredged so that ocean-going ships could enter the Foronir river. They along with Paradomea, controlling the eastern side of the fjord, built a number of towers and fortresses in the area. The area is so fortified that in the Black Tide War, it was wisely blockaded rather than assailed.