Fossa Magna is a great rift lowland in Japan. It is often confused with the Itoigawa-Shizuoka Tectonic Line. However, Itoigawa-Shizuoka Tectonic Line is a line; Fossa Magna is an area. Fossa Magna is Latin for "great crevasse". This name was given by Heinrich Edmund Naumann.
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π Fossa Magna in the context of Itoigawa-Shizuoka Tectonic Line
Itoigawa-Shizuoka Tectonic Line (ISTL) (η³Έιε·ι岑ζ§ι η·, Itoigawa Shizuoka KΕzΕ Sen), also Ito Shizu Sen (η³Έιη·) is a major fault zone on Honshu island running from Itoigawa, Niigata Prefecture, through Lake Suwa, and on to Shizuoka in Shizuoka Prefecture. It is often confused with the Fossa Magna ("great rift"), a geological feature it forms the western boundary of.