Geology & Discovery.
The Bonnechere Caves drop visitors below the Bonnechere River through Ordovician limestone passages with marine fossils — cephalopods, trilobites, and gastropods — set into the cave walls. The system sits on Fourth Chute Road about 8 km east of Eganville and runs guided tours from late May through Thanksgiving; it is the most-developed publicly-toured Ordovician karst cave in Ontario.
The brief.
Tours are guided and run on the operator's seasonal schedule (typically late May through Thanksgiving) — the caves are not a self-guided or spelunking site and the underground sections are off-limits without a guide. The tour is roughly an hour and walks visitors through the main passage system formed in Ordovician limestone, with marine fossils visible in the cave walls.
Tom Woodward developed the system for guided tours starting in the 1950s; the operator has run it as a family business since. Above ground, the Caves grounds at Fourth Chute include picnic facilities and short interpretive paths along the river.
Dress warm — the caves stay cool year-round even in summer. Bookings, hours, and rates are on the Bonnechere Caves website.
2. places.
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Bonnechere Caves (Fourth Chute Road, ~8 km east of Eganville)
Ordovician limestone-cave guided-tour system on the Bonnechere River; marine fossils (cephalopods, trilobites, gastropods) in the cave walls; seasonal late May through Thanksgiving.
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Fourth Chute (Bonnechere River)
Named river chute immediately above the Caves; framed by interpretive paths on the Caves grounds.
Today's read.
Cold but firm — winter-ready conditions · light winds · clean air.