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Pseudonym reading Yuda Yuganuma no Ukishima
Specified type Prefecture designation
Type Natural monuments and plants
Designated date March 8, 1966
Specified details
location Nishiwaga-cho Yukawa
owner Nishiwaga
Holding group
Management organization
home page


Yukawanuma is located about 550 meters above the sea level about 2 km south of the Yugawa Onsen hot spring.
The swamp has a diameter of about 150m, is moist and surrounded by beech forests.
There are prominent wetlands intermingled with sphagnum, yachisge, mikazuki kigusa, turukochemo, horomisou etc. in the north and east of the swamp, and it is presumed that the floating island was generated separately from this wetland.
About 10 large and small floating islands with a diameter of about 10m float on the water surface and are moving by the wind.
Only Yukawanuma is the only place in the prefecture where such a floating island can be seen, and furthermore, there are rare cases of forming a floating island in a high-rise wetland area, which is scientifically valuable.