Fantastic Places in Cool Japan : Nagatoromachi, located in Chichibu-gun, northwestern Saitama Prefecture, is a valley town surrounded by mountains. Around the town are Mt. Fudo, Mt. Jinmi and Mt. Hodo. Arakawa flows through the center of the town. “Nagatoro River Boating” is a popular tourist attraction in Nagatoro-cho where nature is rich. You can experience the powerful boat ride while enjoying the superb view.