Nukufetau
Tuvalu
Nukufetau is an atoll that is part of the nation of Tuvalu. The atoll was claimed by the US under the Guano Islands Act some time in the 19th century and was ceded in a treaty of friendship concluded in 1979 and coming into force in 1983. It has a population of 581 who live on Savave islet (2022 Census).
Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).