archipelago
An archipelago () is a chain or cluster of islands. The word archipelago literally means "chief sea", from Italian arcipelago () , derived ultimately from Greek arkhon (arkhi-) ("leader") and pelagos ("sea"). In Italian, possibly following a tradition of antiquity, the Archipelago (Greek:?p?a?) was the proper name for the Aegean Sea and, later, usage shifted to refer to the Aegean Islands (since the sea is remarkable for its large number of islands). It is now used to generally refer to any island group or, sometimes, to a sea containing a large number of scattered islands like the Aegean Sea.
Types of archipelagos
Archipelagos are usually found in the open sea; less commonly, a large land mass may neighbour them, an example being Scotland which has more than 700 islands surrounding the mainland. Archipelagoes are often volcanic, forming along island arcs generated by subductions zones or hotspots, but there are many other processes involved in their construction, including erosion, deposition, and land elevation.
The five largest modern states that are mainly archipelagos are Japan, the Philippines, New Zealand, the United Kingdom and Indonesia (the world's largest archipelagic state according to the CIA World Factbook)  .
The largest archipelago in the world by size is the Canadian Arctic Archipelago of Northern Canada. It is situated in the Arctic Ocean. The archipelago with most islands is the Archipelago Sea in Finland, but these islands are, on average, very small.
See also
 Island arc
Geography
Earth science
Geomorphology
List of landforms
Plate tectonics
Island nation
Earthsea
The World
Lists of islands: see List of archipelagos and List of islands
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