Where: Japan · Asia · approx. 34.93, 135.91 (vicinity only)
Why this spot: Rockhounding locality: downstream gravels of Japan's most storied topaz mountain, which itself is now off limits
What turns up: quartz, smoky quartz, feldspar, rare small topaz and tourmaline fragments
Access: Gray area.
Tanakamiyama proper is national forest and erosion-control land where digging requires permits and unauthorized collecting is prohibited; picking loose granite-derived stones from public river gravel below the mountain is the tolerated alternative
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.