evidence: Serranilla Bank was first shown on Spanish maps in 1510. It is administered by Colombia as part of the department of San Andrés and Providencia. Although the bank is currently occupied by Colombia, it is subject to a sovereignty dispute involving Colombia, Honduras, Nicaragua, Jamaica and the United States. [...] 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.