The Great Lakes Watershed

—miles of stream

—lakes & ponds

—square miles

Why the streams thicken

a first spring—

The floor of the lake

the shore—

Biggest by the miles above them

Dim everything outside the basin you pick Show the land underneath Get it at print size, 30 by 24 inches

Divides: USGS Watershed Boundary Dataset, the twenty-seven HUC4 subregions of region 04 that reach a lake. Water: USGS NHD High Resolution, which carries Canada at this scale. Lake floors: NOAA NCEI. Relief © Esri. © Ryan Sajdak 2026 · ☕ Coffee