Where: Japan · Asia · approx. 35.36, 137.19 (vicinity only)
Why this spot: Rockhounding locality: river gravels prized for toki-ishi jasper and chalcedony plus chert and volcanics
What turns up: chert, rhyolite, chalcedony, toki-ishi jasper (rare), petrified wood
Access: Clean.
Hand picking loose stones in personal amounts on public river gravel is broadly tolerated; the museum-managed fossil beds upstream near Mizunami require registration and are a separate regime
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.