Yseult Island (66°44′S140°56′E) is a small rocky island 1.1 km (0.7 mi) east of Tristan Island and 0.6 km (0.4 mi) north of the east point on Cape Jules. Photographed from the air by U.S. Navy Operation Highjump, 1946-47. Charted by the French Antarctic Expedition under Barre, 1951–52, and so named because of its twin relationship with Tristan Island.