Arai-juku (新居宿, Arai-juku) was the thirty-first of the fifty-three stations of the Tōkaidō. It is located in the city of Kosai, Shizuoka Prefecture, Japan. During the Edo period, it was located in Tōtōmi Province. The kanji for the post station were originally also written as 荒江 and 荒井 (Arai).
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