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사가현 · Saga City
33.2880°N, 130.4100°E
The Kase River and its tributaries in the southern Saga mountains host one of Kyushu's most concentrated firefly populations — the combination of clean water, low agricultural chemical use, and dense riparian vegetation has maintained conditions for Genji-botaru (the large Japanese firefly) that have disappeared from most of Japan. The firefly season runs June 1–20, and the peak nights (June 8–12 in an average year) see thousands of simultaneous light signals over the river.
기본 정보
영업시간
June evenings only | From dusk (approximately 7:30 PM) | Peak viewing: 8:30–9:30 PM
휴무일: Outside June 1–20 | Rain reduces firefly activity
입장료
Free
베스트 시즌
June 1–20 | Peak: June 8–12 (average year) | Check local reports for exact peak
방문 소요 시간
1.5–2 hours (evening viewing)
가는 방법
교통 정보
Best viewing at the Kase River between Ogi City and Mitsuse Pass. Parking at Kase River Firefly Park, off Route 323. June evenings from dusk (approximately 19:30). Flashlight/phone light use should be minimized.
인사이더 가이드
Peak timing: Fireflies appear from 19:45 and reach maximum density around 20:30–21:30. The first 15 minutes after the first visible firefly are the most exciting — the emergence is rapid.
Photography: Long exposure (30 seconds, f/2.8, ISO 800) captures the light trails without needing the fireflies to be stationary. Keep your position upwind of the river — the fireflies move toward their scent-based partners, and positioning accordingly improves density in frame.
주변 스팟
Kase River Firefly Festival에서 직선거리로 가장 가까운 히든 스팟들입니다.
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