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Kase River Firefly Festival
Investigado y escrito por Hinato
Prefectura de Saga · 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.
Información esencial
Horario
June evenings only | From dusk (approximately 7:30 PM) | Peak viewing: 8:30–9:30 PM
Cerrado: Outside June 1–20 | Rain reduces firefly activity
Entrada
Free
Mejor temporada
June 1–20 | Peak: June 8–12 (average year) | Check local reports for exact peak
Duración de la visita
1.5–2 hours (evening viewing)
Cómo llegar
Información de acceso
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.
Guía privilegiada
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.
Lugares cercanos
Los lugares secretos más cercanos a Kase River Firefly Festival, por distancia en línea recta.
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