The Oceanus's source was located in Thalasia, the fourth layer of Elysium. From there, it flowed through the layers of Belierin, Eronia, and Amoria, moving on to Krigala, the first layer of the Beastlands, where it was joined by several streams flowing from the second layer, Brux. Finally, the river passed through Arvandor and ended by flowing into the waters of Aquallor, the second layer of Arborea, although several maelstroms at the bottom of the infinite ocean transported travelers back to the river's headwaters in Thalasia.