Greenwich Island (variant historical names Sartorius Island, Berezina Island) is an island 24 km (15 mi) long and from 0.80 to 9.66 km (0.5 to 6 mi) (average 523 km or 325 mi) wide, lying between Robert Island and Livingston Island in the South Shetland Islands. Surface area 142.7 square kilometres (55.1 sq mi).