Archipelagos can be found isolated in bodies of water; or a large land mass may neighbour them. For example, Scotland has more than 700 islands surrounding its mainland. Archipelagos are often volcanic, forming along island arcs generated by subduction zones or hotspots, but there are many other processes involved in their construction, including erosion, deposition and land elevation.
The five largest modern countries that are mainly archipelagos are Indonesia, Japan, the Philippines, New Zealand and the United Kingdom. The largest archipelagic state in the world, by size, is Indonesia. The archipelago with the most islands is the Archipelago Sea in Finland.
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