Where: Japan · Asia · approx. 36.17, 138.15 (vicinity only)
Why this spot: Rockhounding locality: Paleolithic Japan's premier obsidian source; today only loose roadside chips are picked, and only ambiguously
What turns up: obsidian chips, rhyolite; garnet localities nearby are closed
Access: Restricted.
The Hoshikuso Pass quarry complex is a protected National Historic Site with no removal, stream diggings are signed against collecting, and the area lies in a quasi-national park; some visitors pick loose 2-3 cm roadside chips near the Higashi-mochiya ruins, which remains legally murky, so treat this mainly as a look-only site and use the Hoshikuso museum
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.