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The Atad Mountains, known to the Fjordell as the Dathreki Mountains, comprise a mountain range on the continent of Opelon on Sel.
The mountains lie along the border of Arelon and Fjorden. For many years, the Derethi were unable to invade Arelon due to the natural barrier afforded by the mountains, contributing to their hatred of the Arelene.
The range is considered a major geographical feature of Arelon; the curvature of the mountains is mirrored in the right side of Aon Aon, the basic symbol of AonDor.
Devotion's Perpendicularity is located in the northern end of the mountains, near Elantris and Kae.