Porthmadog slate-port harbour

Where: Wales · Europe · approx. 52.93, -4.13 (vicinity only)

Why this spot: Victorian bottle era, historically mapped

What turns up: 1820s-1920s bottles, ballast oddities, ship smalls

Access: Permission required.

Harbour is council-run and the estuary protected; consent required.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.