Katabira River

　Katabira River originates in Wakabadai, Asahi-ku. The tributaries such as Naka Horikawa and Ima Igawa are combined and flow along the Sotetsu Line. In the vicinity of Yokohama-sta.-nishiguchi, it is divided into the Ishizaki River, the Aratama River, and the faction Aratama River, and pours into Yokohama Port. In 1958, Typhoon No. 22 (Kano River Typhoon) caused a major disaster in the basin. As a result, full-scale river renovation project was started. The business section of Yokohama City is 6.17 km upstream from the junction of Naka-Horikawa.
　Currently, Katabira River is undergoing river renovation to accommodate rainfall with a scale of 1/6.3. In addition, the riverbed space (Naka-Horikawa confluence-Tsurumai Bridge, extension 600m) was effectively used to develop a water park that makes use of valley scenery such as topography, nature, and water flow. Construction was started in 1983 and completed in 1988. This water park has been maintained as part of the "Promenade Project for Water, Greenery and History" so that citizens can get close to the waterside.