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San Andrés is one of the departments of Colombia. It consists of two island groups about 775 km (480 miles) northwest of Colombia and 220 km (140 miles) from the coast of Nicaragua, and eight outlying banks and reefs. Its capital is San Andrés.
In 1928, Colombia and Nicaragua signed the Esguerra-Bárcenas treaty, which gave control of the islands to Colombia. However, when the Sandinista government assumed power in the 1980s, Nicaragua repudiated the treaty. Nicaragua claims that the treaty was signed under United States pressure and military occupation and thus does not constitute a sovereign decision. Colombia argues that the treaty's final ratification in 1930 (when U.S. forces were already on their way out) confirms its validity. Colombia and Honduras signed a maritime boundary treaty in 1999 which implicitly accepts Colombian sovereignty over the islands.
In 2001 Nicaragua filed claims with the International Court of Justice (ICJ) over the disputed maritime boundary, claiming 50,000 km² in the Caribbean, including the San Andrés and Providencia archipelagoes. Colombia responded that the ICJ has no jurisdiction over the matter, and increased its naval and police presence in the islands. Colombia also defended its claim in the ICJ. On December 13, 2007 the ICJ ruled that the islands were Colombian territory, but left the maritime border dispute unresolved. Colombia and Nicaragua will go through another trial to resolve these claims.
In 1903 the local Raizal population rejected an offer from the USA to separate from Colombia, in the wake of Panama. However, the policy followed by successive Colombian governments, trying to modify the ethnic composition through extensive migration of Spanish-speaking mainland Colombians, resulted in heightening discontent, even more when the assimilation policy was led by Catholic missions in 1947.
Besides the San Andrés and Providencia island groups, there are eight atolls that belong to the Department, including submerged Alicia Shoal
San Andrés Island is the main island of the San Andrés group, and the largest in the department. It measures 12 km in length with a width of 3 km and covers an area of 26 km². There is a tiny lagoon in the center of the island called Big Pond. The principal town is San Andrés in the north of the island. Another town is San Luis on the east coast. Johnny Cay (Cayo Sucre) 
lies 1.5 km ENE of German Point (Punta Norte), the island's northern tip, and Haynes Cay about the same distance east of the island. Cotton Cay is less than 1 km south of San Andrés town, on the northeastern coast.
Cayos de Albuquerque is an atoll southwest of San Andrés. It is the westernmost point of Colombia. The fringing reef is about 7 km across. In the southern part are Cayo del Norte and Cayo del Sur. Cayo del Norte, the larger of the two, is up to 2 m high and overgrown with palm trees and bushes. Cayo del Sur, a few hundred metres further South, reaches a height of a little more than 1 m and is vegetated with a few bushes, and in the South with mangroves. There is a lighthouse on Cayo del Norte, at 12°10′N, 81°50′W, operating since 1980. It is maintained by the Colombian Navy.
Cayos del Este Sudeste is an atoll is 22 km east-south-east of San Andrés Island and 35 km northeast of Cayos de Alburquerque. It is 14 km long and 4 km wide. There are a few sand cays in the southeast. The largest ones are Cayo del Este, Cayo Bolivar, West Cay, and Cayo Arena, none of which are higher than 2 metres. All cays are overgrown with palm trees and scrub, and surrounded by mangroves. There is a Colombian Navy lighthouse on Cayo Bolivar. The cays are regularly visited by fishermen from the Colombian mainland and San Andrés. There are two concrete buildings on Cayo Bolivar, and a few wooden huts on the other cays.
Providencia Island is the main island of the Providencia group, and the second largest of the department. Providencia and Santa Catalina Island (a small satellite island close off its northern end) extend 7.2 km in a north-south direction. The land area of Providencia Island measures 17 km². The mountainous center of Providencia Island rises to three peaks of about the same elevation: roughly 363 meters. The island consists of sedimentary rocks laid down on a former volcano. The chief settlement is Isabel Village in the north, near Santa Catalina Island. Other villages are San Felipe on the west coast, and La Paz in the southeast. Low Cay, a very small islet, lies more than 10 km further north. Crab Key and Tres Hermanos lie just off the coast.
Colombia also claims sovereignty over six additional outlying banks and shoals: Alice Shoal, Bajo Nuevo Bank, Serranilla Bank, Quita Sueño Bank, Serrana Bank, and Roncador Bank.
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