Alborak

Alborak was a volcanic island in the Sarpic Seas, situated in the Gates of Ghirn between the Saulean Sea and the Sea of Pearls, which was home to the city of Qoss up until its complete destruction in the Great Cataclysm. 
Alborak was crescent-shaped, roughly twelve miles in diameter, and almost completely enclosed a circular bay. This sheltered bay, open to the sea only via the gap less than a mile wide between the horns of the crescent, was an ideal natural harbor. Qoss stood upon its shores with the titanic spires of the Sorcerer-King's palace looming over all. The arc of the island's crescent was mostly steep-sided and rocky; Qoss itself rose in stairstep tiers up the interior slope facing the harbor, and outside its walls, terraced groves and gardens clung to the precipitous hillsides. 
Alborak and Qoss were completely obliterated by the Great Cataclysm and no trace of them remains. Nothing but the rolling blue expanse of the open sea is now to be seen where once was the seat of a great empire.