Lesidren Island (Bulgarian: остров Лесидрен, ‘Ostrov Lesidren’ 'os-trov 'le-si-dren) is the second largest and southernmost island in the Zed group off the north coast of Varna Peninsula, Livingston Island in the South Shetland Islands, Antarctica. The island is ice-free, extending 800 by 600 m (870 by 660 yd) with surface area 33 hectares (82 acres). Separated from the neighbouring Phanagoria Island and Koshava Island by channels 130 and 140 m (140 and 150 yd) wide respectively.