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The subducting plates, being deeper than the Eurasian plate, pulled Japan eastward, opening the Sea of Japan around 15 million years ago.
The Strait of Tartary and the Korea Strait opened much later.
Several (9 or 10) oceanic plates were completely subducted and their remains have formed paired metamorphic belts.
The island is 810 miles (1,300 km) long and it has a varied topography that includes many different mountain ranges, some of which are volcanic.
Hot springs are numerous and have been developed as resorts.
, the subduction of the oceanic plates started, and this process continues to the present day, forming a roughly 400 km wide orogeny at the convergent boundary.
The early stages of subduction-accretion have recycled the continental crust margin several times, leaving the majority of the modern Japanese archipelago composed of rocks formed in the Permian period or later.
Around 23 million years ago, the now Western Japan was a coastal region of the Eurasia continent.