The Ai River (相川, Ai-kawa) is a river in Japan which has its source in the city of Sekigahara, Gifu Prefecture. It drains into the Kuise River, and ultimately flows into the Kiso River.[1] The river originates near Mount Ibuki in the northern part of Sekigahara and flows through central Tarui. The post town of Tarui-juku, a stop along the old Nakasendō trading route, used to sit along the banks of the river. | ||||||
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Length: 18.1 km (11.2 mi) | ||||||