From Akita Wiki
Lake Towada forms the centerpiece of one area of Towada-Hachimantai National Park. At 61.1km² it is the 12th largest lake in Japan by surface area, and the 3rd deepest in Japan at 327.0m. (The deepest in Japan is Towada's cousin to the south, Lake Tazawa)
Towada is a double caldera lake, and the volcano that formed it is still considered to be active. The crater that the lake resides in is thought to have been caused by eruptions roughly 55,000, 25,000, and 13,000 years ago.
Until 2008, the boundaries that separated Aomori and Akita had not been clarified since the Edo Period, resulting in confusion over which prefecture Lake Towada belonged to. In 2008 it was decided that 60% of the lake belonged to Aomori, and 40% of the lake belonged to Akita.
Towada's most famous attraction would likely be the "Maiden Statue" on its shore, created by famed Japanese artist Kotaro Takamura. Other attractions include regularly scheduled pleasure cruises and the Towada Museum. The lake also offers impressive views of the fall leaves earlier than any other spot in the prefecture.