The Solstheim ashlands are a region of Solstheim that covers the entire southern half of the island. It formed as the result of the Red Year of 4E 5, when Red Mountain erupted and devastated the province of Morrowind. The ashfall extended far into the Sea of Ghosts, covering the southern coast of Solstheim for many years. The constant ashfall, combined with the blast wave from the eruption, resulted in the creation of the ashlands and the almost complete destruction of the Hirstaang Forest, of which only a few small groves on the border of the Isinfier Plains survived.
The event proved to be catastrophic for both the island's inhabitants and the local wildlife. Fort Frostmoth was irreparably damaged, and Raven Rock would have been buried beneath the ash were it not for the construction of a giant wall called the Bulwark. The devastation gave rise to mysterious burnt spriggans, vengeful nature spirits that roam the cindering ashlands. The region is covered in impact craters caused by the ejection of Heart Stones from Red Mountain, The presence of the Heart Stones led to the formation of the Ash Spawn, which attack settlements in the region. In 4E 16, the High King of Skyrim gifted Solstheim to Morrowind, and Dunmer refugees fled to the island. Flora and fauna native to Morrowind soon found their way to Solstheim, either through natural migration or deliberate planting by the Dunmer. Netch, silt striders, ash hoppers, scathecraw, trama root, emperor parasols and ash yams all became commonplace in the new ashlands. The spread of ash also affected local plants such as creep clusters and spiky grass.
- Events of Dragonborn