later history it has been the subject of conflicting claims made by a number of sovereign states. In most cases, the dispute stems from attempts by a state to expand its exclusive economic zone over the surrounding seas. Between 1982 and 1986, Colombia maintained a formal agreement with Jamaica which granted regulated fishing rights to Jamaican vessels within the territorial waters of Serranilla Bank and nearby Bajo Nuevo Bank. In November 1993, the two states agreed upon a maritime delimitation treaty establishing a "Joint Regime Area" to cooperatively manage and exploit living and non-living resources in designated waters between the two banks. However, the territorial waters immediately surrounding the cays themselves were excluded from the zone of joint-control, as Colombia considers these areas to be part of her coastal waters. The agreement came into force in March 1994. Nicaragua lays claim to all the islands on its continental shelf, covering an area of over 50,000 km2 in the Caribbean Sea, including the Serranilla Bank and all islands associated with the San Andrés and Providencia archipelagoes. It has persistently pursued this claim against Colombia in the International Court of Justice (ICJ), filing cases in both 2001 and 2007. 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. Honduras claims Serranilla Bank as part of its national territory in Article 10 of its Constitution. In 1986, it agreed upon a maritime boundary demarcation with Colombia that excluded Honduras of any control over the bank or its surrounding waters. The ratification of this boundary on 20 December 1999 proved to be controversial within Honduras, as it ensured that the state implicitly recognised Colombia's sovereignty