Iruma River, River system in Saitama Prefecture, Japan.
The Iruma River is a river system that flows over 63 kilometers through Saitama Prefecture, running from Mount Omochi to where it meets the Arakawa River at Kawagoe. Along its route, it passes through several municipalities and forms an important waterway in the region.
The river played an important role for agriculture over centuries and enabled the development of transportation routes between different settlements. Its water management helped shape the region and connect communities together.
During cherry blossom season, the riverbanks become gathering places where people celebrate the traditional hanami festival with food and festivities.
The river has multiple access points that invite fishing, walking, and cycling, with designated paths connecting different municipalities. Visitors should choose the best season and check which sections are most accessible.
Near the river sits the Sasai Fossil Forest with preserved geological formations that document the ancient ecological history of the Saitama region. These fossils show how the environment has changed over thousands of years.
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