Atsyllean Sea

The Atsyllean Sea is a body of water just southeast of the center of Rathnir. The sea borders Alteniquia to the north and west and Sparwood to the east and south. It is the largest fully isolated body of water in Rathnir, with some even considering it to be the largest lake in the world. The sea is the historic home of the nation of Talor, with the islands since falling under the possession of Yimmu-Audal.

The Astyllean Sea has many islands, a connection to the Rough Sea to the south via the Hraam Strait, and a canal to the Sea of Pearls to the north. The ocean's climate is much one of the coldest of any body of water outside of the Great Southern Ocean, the colder winds forming a much moister environment around the coast than the Alteniquian interior. The sea is home to many unique species, and until very recently with the opening of a canal into the Great Southern Ocean near Athazolant, the ocean was comprised entirely of independent species.

The Essukdalad county of Astyllea gained its name from a misspelling of the Atsyllean Sea. This misspelling was popularized in the Audalad and Aldoviri cultural spheres which lead to the Empire of Astyllea being spelled the same as the county, despite being named after the body of water.