The Eltheric Ocean is the large body of water west of Tamriel. It contains islands and island groups of Yokuda, Summerset Isles, Pyandonea, Thras, the Sestres, Cespar, Herne, and Stros M'kai. It meets the Padomaic Ocean in the east and encompasses the Abecean Sea, Azurian Sea, and the Sea of Ghosts.
- This is the ocean crossed on the invasion of Akavir sometime in the year 3E 288. The battle was led by Emperor Uriel Septim V at the Battle of Ionith, where the Imperial army was defeated along with their Emperor, Uriel V.