Starbuck Island (or Volunteer Island) is an uninhabited coral atoll in the central Pacific, and is part of the Central Line Islands of Kiribati. Former names include "Barren Island", "Coral Queen Island", "Hero Island", "Low Island", and "Starve Island".
Located at 5°38′30″S 155°52′40″W / 5.64167°S 155.87778°WCoordinates: 5°38′30″S 155°52′40″W / 5.64167°S 155.87778°W, and measuring 8.9 kilometres (5.5 miles) east-to-west and 3.5 kilometres (2.2 miles) north-to-south, Starbuck Island has a land area of 1,620 hectares (4,003 acres). It is a low, dry, coral limestone island with a steep beach backed by a 6–8-metre-high (20–26 ft) bank composed of large coral fragments. Several hypersaline lagoons form on the island's eastern side. These occasionally dry up, and are said to be dangerous to approach: one worker during the island's guano-mining days sank up to his neck in salty mud before being rescued.
There is no freshwater on the island, which is one of the drier atolls in the Line Island group. Annual yearly rainfall averages approximately 800 mm (31.5 in).