The Tanerde Strait (pronounced tah-NER-day) is a long, narrow passage that connects the Sea of Ersas in the south with the Phiora Sea to the north. The strait separates Hellea from Thadria, though for millennia both sides have been under the control of Viridia. Tall, rocky cliffs line both sides of the strait for most of its length, though they slowly become less pronounced in the north.
Two of Viridia's largest cities, Ilirnas and Felasan, are located across the strait from each other where it opens into the Phiora Sea. This particular part of the Tanerde Strait narrows significantly, and is widely known as the Tanderde Gates. Viridia maintains a tight control on trade through the strait through their control of this passage.