
The Mariana Islands (also the Marianas) are an arc-shaped archipelago made up by the summits of fifteen volcanic mountains in the north-western Pacific Ocean between the 12th and 21st parallels north and along the 145th meridian east. They are south of Japan and north of New Guinea, and form the eastern limit of the Philippine Sea. The islands wer...
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http://en.wikipedia.org/wiki/Mariana_Islands

island arc, a series of volcanic and uplifted coral formations in the western Pacific Ocean, about 1,500 miles (2,400 km) east of the Philippines. ... [4 related articles]
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http://www.britannica.com/eb/a-z/m/35

[
n] - a chain of coral and volcanic islands in Micronesia halfway between New Guinea and Japan
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http://www.webdictionary.co.uk/definition.php?query=Mariana%20Islands
Marianas noun a chain of coral and volcanic islands in Micronesia (including Guam and the Northern Marianas) halfway between New Guinea and Japan; discovered by Magellan in 1521
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https://www.encyclo.co.uk/local/20974
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