, chief atoll of Tuvalu
, S Pacific. It comprises 30 islets of a reef 13 mi (21 km) long, with a land area of c.1 sq mi (2.6 sq km). The islet of Fongafale
The atoll was discovered in 1819 and became part of a British colony in 1915. An expedition led by Sir Edgeworth David in 1897 proved the Darwinian theory of atoll formation (see coral reefs
) by sinking a 1,100 ft (335 m) bore into the island.
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