Quita Sueño Bank
Colombia
Quita Sueño Bank (claimed as Quitasueño) is a reef formation controlled by Colombia and within the Archipelago of San Andrés, Providencia and Santa Catalina. The United States, under the Guano Islands Act, claimed the reef in 1869, and retained its claim until 1981. The United States constructed a lighthouse in 1919.
Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).