Yunoko lake (湯ノ湖) is a 3km round lake at a height of 1478m above sea level. The lake is a popular spot for trout fishing and its season runs from May 1st to September 30th.
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Lake Chūzenji (中禅寺湖, Chūzenjiko) is a scenic lake in Nikkō National Park in the city of Nikkō, Tochigi Prefecture, Japan. It was created 20,000 years ago when Mount Nantai erupted and blocked the river. The lake has a surface area of 11.62 km² and a circumference of 25 km. [Wikipedia]
The Kegon Falls are located on Lake Chuzenji in Nikko National Park in Tochigi Prefecture. The 97-meter-high falls are one of Japan's top three waterfalls and are also considered one of the top eight viewpoints in Japan from the Showa period. Overall, they exist 12 waterfalls, all located under or parallel to a large waterfall, the other two famous waterfalls are Nachi Waterfall in Wakayama Prefecture and Fukuroda Waterfall in Ibaraki Prefecture. They are especially popular during the fall foliage season when visitors travel to Nikko to admire the golden-orange colors. You can use an elevator there to see everything up close. In winter, the waterfalls even freeze over completely.