01 / Koridono Pond
Floating islands drift togetherand apart, on wind and current.

The pond lies at about 230 m on the Nishiyama hills and covers roughly 70 ares. The city writes that its floating islands keep drifting together and apart on wind and current, and the prefecture writes that there are more than 20 islands of reeds, irises and other plants. It was designated a Niigata Prefecture Natural Environment Conservation Area in 1979 and a prefectural natural monument in 2004.
- About 230 m above sea level, roughly 70 ares
- 20+ floating islands (prefectural source)
- 1979: prefectural Natural Environment Conservation Area
