Explore › NorCal bottle digging
San Rafael Canal mouth flats
BOTTLE DIGGING
GRAY AREA
INFERRED
Where: NorCal · approx. 37.96, -122.5 (vicinity only)
Why this spot: 1850s mission town; canal dredged 1870s for schooner trade
Access: Gray area.
State tidelands at the canal mouth.
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.