evidence: Serranilla Bank is a former atoll, now a mostly submerged carbonate platform consisting of shallow reef environments. It is about 40 km in length and 32 km in width, covering an area of over 1,200 km2, 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. They are largely barren, with sparse vegetation of bushes and some trees. Most of the reef is drying and many shipwrecks are located in its vicinity. [...] The United States' claim was made in 1879 and 1880 under the Guano Islands Act by James W. Jennett. Most claims made by the U.S. over the guano islands in this region were officially renounced in a treaty with Colombia, dated September 1972. But whether or not Serranilla Bank was included in the agreement is disputed—there is no specific mention of the feature in the treaty and, as per Article 7 of the said treaty, only matters specifically mentioned in the document are subject to it. According to other records, as well as claims made within the ICJ, Colombia is recognised by the United States as having varying degrees of sovereignty over Serranilla Bank through the treaty of 1972, which took effect in September 1981. The U.S. considers the reef to be an unorganized, unincorporated United States territory.