Lake Haruna sits within the caldera of Mount Haruna, its calm waters framed by the mountain’s distinctive jagged peaks, including the sharply pointed Sugenoyama, creating one of Gunma’s most photogenic natural landscapes. Warmer months bring pedal boats, lakeside walking paths and hiking trails up the surrounding peaks, while in the coldest winters, when the lake freezes solid, it transforms into a popular ice-fishing destination where visitors drill through the ice to catch smelt, a distinctive seasonal activity.
🗓️ At a Glance
| Location | Near Ikaho, Gunma |
| Hours | Always accessible; ice fishing season roughly January–February |
| Admission | Free (lake access); ice fishing gear rental around ¥1,500–2,500 |
| Time needed | 1.5–2.5 hours |
| Best time | Autumn (foliage); January–February (ice fishing, when lake freezes) |
What to See
- A scenic crater lake framed by Mount Haruna’s jagged peaks.
- Boating and lakeside walking paths in warmer months.
- Hiking trails up the surrounding mountain peaks.
- Seasonal ice fishing when the lake freezes solid.
Combine Your Visit
- Combine with Ikaho Onsen sightseeing nearby.
- Pair with Mizusawa Udon tasting.
- Read our Gunma overview .
Getting There
- By bus: bus from Ikaho or Shibukawa Station toward Lake Haruna.
- By car: roughly 2–2.5 hours from central Tokyo; winter tyres required in cold months.
Tips
Whether the lake freezes solid enough for ice fishing varies year to year depending on winter temperatures — check current conditions before planning a trip specifically for this activity. Autumn foliage viewing pairs well with the lake’s calm waters for striking reflection photography.
