Lake Inawashiro — Mt. Bandai's Crystal Clear Mountain Lake
Lake Inawashiro (猪苗代湖) is Japan's fourth-largest lake, spanning 103 square kilometers at 514 meters elevation, famous for its exceptional water clarity (up to 10-meter visibility) that rivals ocean waters. Fed by underground springs from Mt. Bandai and surrounding volcanic peaks, the lake was historically acidic (around pH 5 in the early 20th century) but has since become neutral, supporting clear blue waters ideal for swimming, windsurfing, kayaking, and SUP (stand-up paddleboarding). The northern shore provides unobstructed views of Mt. Bandai (1,816m), whose volcanic cone reflects perfectly in calm morning waters, earning the lake its nickname 'Tenkyō-ko' (天鏡湖, 'Heavenly Mirror Lake').
The lake region offers year-round activities: summer water sports (July–August water temperature reaches 23°C), autumn foliage drives along the lakeside Bandai-Azuma Skyline (September–October), winter swan watching when thousands of whooper swans migrate from Siberia (November–March), and spring cherry blossoms at Kamihatoriko lakeside parks (late April). The Inawashiro volcanic rock bottom creates unique bathing conditions — the mineral-rich water is said to have beautifying properties, and lakeside onsen resorts combine bathing with panoramic mountain views.
Essential Information
Opening Hours
Shidahama Beach: open 24/7 (swimming July–August) | Tenkyō-dai Observatory: always accessible | Boat cruises: 9:00 AM–4:00 PM (seasonal) | Swan viewing at Osawa lakeside: 24/7 (best 6:00–9:00 AM)
Closed: No closure | Boat cruises operate April–November only | Water sports rentals: July–September
Entrance Fee
Lakeside access: free | Boat cruises: ¥1,500 (40 min) | Kayak/SUP rental: ¥2,000/hour | Windsurfing lessons: ¥5,000/2 hours
Best Season
July–August for water sports | November–March for whooper swan migration | October for autumn foliage and Mt. Bandai reflection photography
Visit Duration
2–3 hours (lakeside walk + single activity) | Half day (water sports or swan watching + boat cruise) | Full day with Mt. Bandai hiking combination
Getting There
Access Information
Insider Guide
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