Mount Satanmet was an active stratovolcano on the center of the Demonatch Island, Aels. It was over the convergent plate margin between the Zarhuycan Plate and the Aelian Plate. it was the tallest active volcano on southern Aels, around 3,400 m high, though that elevation varied with summit eruptions.
Mount Satanmet was one of the most active volcanoes in Aiers in its time and was in an almost constant state of activity. The fertile volcanic soils of Demonatch supported extensive agriculture, with vineyards and orchards spread across the lower slopes of the mountain and the near plains.
It had some important accesses to the Underworld of Kazrrad, and was known for being the place of Apparition of Demons, who first reached the surface in mount Satanmet: the original name of Mount Satanmet was Bomorfi, but as the demons first surged from the underworld and reunited in what they called the meeting of Saatan, came the name Satanmet to be.
During the Middle Human Age, the human-elven alliance built a fortress in Mount Satanmet, to seal the entrances to lower Kazrrad and to keep the Soul Stones of the Great Demon Lords, until the fortress was stormed by the Witch King of Dol-Nur.