The Isles of Reus were a collection of islands about 400 miles off the northwestern coast of Duvonte.
The islands shifted over time, but always remained roughly in the same orientation. Early in the Cabalum, when groups of intelligent life were still forming, the giants on the region of Isles of Reus conflicted greatly with the humans nearby. To end the conflicts, Beskem cleaved the land, sending Reus off on its own, as the Giants were too destructive, too much like the Primordials. On this formed island, the giants developed. Connections to Chaos were strong in the region, so destructive natural phenomena were common.
The giants adapted too, taking on attributes from the region the settled in - Frost Giants adapted to the cold of the Depths of the Primordials, Fire Giants evolved to live amongst and even inside the magma of the Flames of the Primordials, Stone Giants learned to live underground and mold the stone around them, and Storm Giants tamed the clouds above, drawing on the powers of the Heights of the Primordials. Hill Giants were among those that survived, but did not adapt like their sister tribes did.
As differences arose and groups established, the aggressive and territorial Giants began to war amongst themselves. Before they could annihilate themselves, Beskem sought to solve the issues again by cleaving the region again, splitting the land into distinct islands: Frost Giants in the north, Stone Giantss in the west, Fire Giants in the south, and Hill Giants in the east.
During the Gait Era, the islands were avoided for multiple reasons. The connections to the Chaos planes spurn frequent, unpredictable, and dangerous occurrences like freak storms, earthquakes, floods, and sudden eruptions. The Giants were constantly battling one another, and would only turn away from the other shores to harass or even sink any ships that sailed too close. One common factor amongst all the Giants was that they would always war with humans, given the chance. Some individuals with treatises or connections with one or several groups there can traverse in relative safety, depending on the strength of those bonds.