Whether wetlands are covered in fresh water or salt water, they're rich in wildlife. See what kind you can spot while exploring Senjogahara Marshland.
You'll have no end of sightseeing choices in Nikko. Senjogahara Marshland is a good place to kick off here, but there are many other fine places to explore. Lake Chūzenji, Nikko Yumoto Ski Area, and Kegon Falls are not far from the water-covered landscape and and will cap off your day nicely.