The Venomous Fens is a region located in the southwestern portion of Shadowfen and is on the western border of the Black Marsh province. To the north of Fens is the Reticulated Spine, to the east is the Leafwater region, and to the south is the entrance to the Murkmire region. The town of Hissmir is located in the center of the region and serves as the central hub of the Fens. North of the town is Zuuk, a Kothringi village founded by Lord Zuuk, who was close to the late Empress Tavia, wife of Emperor Reman Cyrodiil III. Northwest of Hissmir are the ancient ruins of Arx Corinium and the White Rose Prison, both of which were created by the Imperials. The Ayleid ruins of Loriasel houses the Mnemic Egg.