01 / Sabigawa Fusekoshi
Water passed in a pentagonal tunnelbeneath a river that runs underground.

In 1885 the Nasu Sosui canal passed beneath the bed of the Sabigawa River, a river whose flow goes underground, through a tunnel of cut stone. Its cross-section was a pentagon, and it was about 267 m long. The gaps between the stones were filled with sulphur brought from Mount Nasu. A new tunnel beside it replaced the old one in 1969, and the shape of its outlet still remains.
- Built 1885
- About 267 m long
- Pentagonal cross-section

