Where: California · North America · approx. 38.09, -122.27 (vicinity only)
Why this spot: 1900 historic-map era
What turns up: Navy-yard and river-town bottle glass, ceramic and hardware in the strait mud below the old shipyard.
Access: Restricted.
Former naval shipyard and state-owned strait bed; access restricted and historic material protected.
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.