Koshiarasawa Weir


Koshiarasawa Weir村

This canal was constructed to guarantee a water supply for daily life, but later it came to be used for irrigation. Using natural stone and running against a backdrop of the Northern Alps, the canal is home to fish like char and sculpin that favor clear streams, and it creates a rich natural environment, with Japanese luehdorfia, a kind of swallowtail butterfly, fluttering around it. “Midori Net Omachi Local Water Measures Council” holds nature watching events and conservation efforts, which endears it to the local people.


address Omachi City
since Kamakura Period – Nanbokucho Period (13th – 14th century)
access About 10 minutes by car from Shinano-Kizaki Station


Agricultural Land Development Division, Agricultural Administration Department, Nagano Prefecture