The Haya River near Odakyu Electric Railway 's Hakone-Yumoto Station
The Haya River (Japanese : 早川 = Hayakawa, literally a fast-flowing river ) is a river that flows in Hakone and Odawara , Kanagawa, Japan . It is a 26 kilometres (16 mi) long river, starting from the Kojiri Water Gate (湖尻水門) at the northern tip of Lake Ashi , gathering rain and hot spring water as it flows in the Sengoku , the Mount Hakone caldera , running down beside the towns of Hakone Hot Springs , and emptying near Odawara Fishing Port (35°14′23.38″N 139°8′50.86″E / 35.2398278°N 139.1474611°E / 35.2398278; 139.1474611 ) into Sagami Bay of the Pacific Ocean .
Lake Ashi is not the source of the Haya River, because it is drained through the Fukara Water Gate to the Fukara Acqueduct [ja ] , completed in 1676, which leads to Shizuoka Prefecture . The Sukumo River (須雲川 ) is the Haya's largest tributary . The Chisuji Falls (千条の滝 ) are on another tributary, the Jakotsu River (蛇骨川).[ 1]
The Haya is famous for ayu fishing in summer, in its midstream. A section of the Haya near Hakone-Yumoto Station on Odakyu Group 's Hakone Tozan Line is known as a place where one can observe fireflies in each June .[ 2]
The Old Tokaido Highway runs alongside the Hayakawa River, from Itabashi, Odawara, to Miyanoshita, Hakone.
The 2,900 kW Hayakawa Hydroelectric Station is on this river.[ 3]
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Haya River .