Cornwall Island is a low ice-free island off the north coast of Robert Island in the South Shetland Islands, Antarctica. Surface area 15 hectares (37 acres). Mónica Rock (62°20′28.4″S59°44′27″W) is lying 1.65 km (1.03 mi) west of the island and 3.4 km (2.1 mi) north of Passage Rock, 2.84 km (1.76 mi) east of Table Island and 2 km (1.2 mi) south of Potmess Rocks.