Why it's the capital
When Tuvalu was founded as a new nation in 1978, Funafuti was chosen as its administrative capital, even though Cyclone Bebe had badly damaged the atoll in 1972.
Capital of TuvaluFunafuti is a coral atoll: at least 29 narrow islets form a ring around a wide lagoon called Te Namo, which is about 24.5 km long from north to south.
When Tuvalu was founded as a new nation in 1978, Funafuti was chosen as its administrative capital, even though Cyclone Bebe had badly damaged the atoll in 1972.
From Suva in Fiji, go almost straight north by about 10 degrees of latitude. Funafuti sits there, just west of the 180° line.
Some maps label the capital Vaiaku or Fongafale: Vaiaku is the administrative centre on Fongafale, the largest islet of Funafuti atoll.
Sources: Wikipedia: Funafuti, Wikipedia: Fongafale