Sawyer MI: Warren Dunes glass line

Where: Midwest · North America · approx. 41.9, -86.6 (vicinity only)

Why this spot: Three miles of southeast Lake Michigan shore that concentrates tumbled glass from a century of lake-shipped and resort-town refuse

What turns up: beach glass, slag bits, fossil fragments, worn crockery

Access: Open / legal.

State park: entry fee or Recreation Passport required; Michigan allows only small personal quantities of stones from state land and no digging in dunes

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