The Kazura bridge in the Iya District of Tokushima Prefecture is famous for being one of the rarest bridges in Japan. The bridge is 45 meters long, 2 meters wide, and is suspended 14 meters above the valley. Rather than reinforced concrete or other artificial materials, the bridge is made of woven wire, logs, and the shirakuchi-kazura plant. In order to accommodate the large number of visitors, the bridge is replaced every three years. The area around this bridge is a deep mountain valley, and bridges were built at various places to provide a route for the local people. The seasonal beauty of the valley that can be seen when crossing the bridges is also popular among tourists.