One of the most famous lakes in Japan, Lake Mashu is a crater lake devoid of boats, resorts, and other tourist traps. In fact, people are prohibited from going to the lake. We can view it, but no touching. Perhaps one of the most unpolluted lakes in Japan or the world. The water transparency is one of the deepest in the world. Pristine lake part of the Akan-Mashu National Park.

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Lake Kussharo is another scenic lake in Akan-Mashu National Park in eastern Hokkaido. Japan's largest caldera lake. Unlike Lake Mashu, Kussharo is accessible to tourists.

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Mt. Io, meaning "Sulphur Mountain," is a lava dome spewing steam and sulphur gases. Tourists can walk and easily see the sulphur and steam vents. Note that there are other mountains named Mt. Io (Io-zan). This one is near Kawayu Onsen hot spring in Hokkaido.

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