923 feet straight down.

Lake Michigan is the deep one. Cold enough to kill you in July, deep enough to keep whatever it takes. The bathymetric chart — real contours, real soundings, Chicago's coordinates set below the mark — printed edge to edge.

The second shore. Same cold water as the 216, different city standing on it.

• 30″×60″
• Soft poly-cotton blend, printed one side, white reverse
• All-over sublimation — the chart runs the full length
• Machine washable
• Free US shipping

CBY CHI · the 312. Est. 2026.