evidence: Serranilla Bank is a former atoll, now a mostly submerged carbonate platform consisting of shallow reef environments. It is about 40km (30miles) in length and in width, covering an area of over 1200km2, almost entirely under water. Three small cays and two rocks emerge above the water to form the bank's islands. These are West Breaker, Middle Cay, East Cay, Beacon Cay and Northeast Breaker.[8] They are largely barren, with sparse vegetation of bushes and some trees. Many shipwrecks are located in its vicinity.[9] The bank lacks coral reefs and has minimal sediment cover. Accretion of the bank is not keeping up with sea level rise. The southeastern portion is covered mainly by hardgrounds, while the rest of the bank is mostly covered by thin Halimeda sediments.[10] [...] - Web site: Acquisition Process of Insular Areas . . 2008-01-13 . dead . https://web.archive.org/web/20120414172502/http://www.doi.gov/oia/Islandpages/acquisition_process.htm . 2012-04-14 . lists Serranilla Bank as an insular area under U.S. sovereignty. - Treaty of exchange between Colombia and the United States, 1972 - Web site: Application of the U.S. Constitution . . November 1997 . 2008-01-13 . 2008-02-16 . https://web.archive.org/web/20080216015423/http://www.gao.gov/archive/1998/og98005.pdf . dead . Page 39 states that U.S. sovereignty over Serranilla Bank is disputed. "Currently, the United States conducts maritime law enforcement operations in and around Serranilla Bank and Bajo Nuevo consistent with U.S. sovereignty claims." This is the only archived document from this source that mentions Serranilla Bank as an insular area.