See all Attractions in Takasaki Takasaki for: Adventure, Food And Dining, Art And Culture, Nightlife, Spa, History, First Timers, Family, Romance, Shopping Lake Haruna About Lake Haruna (榛名湖, Haruna-ko) is a caldera lake. It lies near the summit of Mount Haruna, within the city limits of Takasaki, Gunma Prefecture, Japan. A former name for the lake is Lake Ikaho (伊香保沼, Ikaho-numa). Add to Wish List
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