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An archipelago (// (listen) ARK-ih-PEL-ə-goh), sometimes called an island group or island chain, is a chain, cluster or collection of islands, or sometimes a sea containing a small number of scattered islands.
Indonesia, Andaman and Nicobar Islands, the Galápagos Islands, Japan, the Philippines, Maldives, the Balearic Isles, the Bahamas, the Aegean Islands, Hawaii, the Canary Islands, Malta, the Azores, Canadian Arctic Archipelago, Archipelago Sea (Finland) and the Shetland Islands are all examples of well-known archipelagos. They are sometimes defined by political boundaries. The Gulf archipelago off the pacific coast forms part of a larger archipelago that geographically includes Washington state's San Juan islands. While the Gulf archipelago and San Juan islands are geographically related, they are not technically included in the same archipelago due to manmade geopolitical borders. 
The word archipelago is derived from the Ancient Greek ἄρχι-(arkhi-, "chief") and πέλαγος (pélagos, "sea") through the Italian arcipelago. In antiquity, "Archipelago" (from medieval Greek *ἀρχιπέλαγος and Latin archipelagus) was the proper name for the Aegean Sea. Later, usage shifted to refer to the Aegean Islands (since the sea is remarkable for its large number of islands).
Archipelagos may be found isolated in large amounts of water or neighbouring a large land mass. For example, Scotland has more than 700 islands surrounding its mainland which form an archipelago.
Archipelagos are often volcanic, forming along island arcs generated by subduction zones or hotspots, but may also be the result of erosion, deposition, and land elevation. Depending on their geological origin, islands forming archipelagos can be referred to as oceanic islands, continental fragments, and continental islands.
Oceanic islands are mainly of volcanic origin, and widely separated from any adjacent continent. The Hawaiian Islands and Easter Island in the Pacific, and Île Amsterdam in the south Indian Ocean are examples.
Sets of islands formed close to the coast of a continent are considered continental archipelagos when they form part of the same continental shelf, when those islands are above-water extensions of the shelf. The islands of the Inside Passage off the coast of British Columbia and the Canadian Arctic Archipelago are examples.
Artificial archipelagos have been created in various countries for different purposes. Palm Islands and the World Islands off Dubai were or are being created for leisure and tourism purposes. Marker Wadden in the Netherlands is being built as a conservation area for birds and other wildlife.
- Island arc
- List of landforms
- List of archipelagos by number of islands
- List of archipelagos
- Archipelagic state
- List of islands
- US Department of Commerce, National Oceanic and Atmospheric Administration. "What is an archipelago?". oceanservice.noaa.gov. Retrieved 7 July 2020.
- Whittaker R. J. & Fernández-Palacios J. M. (2007) Island Biogeography: Ecology, Evolution, and Conservation. New York, Oxford University Press
- McFadden, Christopher (22 December 2019). "7+ Amazing Facts About Dubai's Palm Islands". Interesting Engineering. Retrieved 8 July 2020.
- Wainwright, Oliver (13 February 2018). "Not the end of The World: the return of Dubai's ultimate folly". the Guardian. Retrieved 8 July 2020.
- Boffey, Daniel (27 April 2019). "Marker Wadden, the manmade Dutch archipelago where wild birds reign supreme". the Guardian. Retrieved 8 July 2020.
- Indonesia. The World Factbook. Washington, DC: Central Intelligence Agency of the United States. 4 December 2008. Archived from the original on 10 December 2008. Retrieved 7 December 2008.
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