Sea or bay
Traiectus Stadiorum CC
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Traiectus Stadiorum, with the numeral two hundred, is not a town but a note written into the sea beside a bay at the end of the Peloponnese: 'a crossing of two hundred stades'. Marking a sea passage at all is most unusual on the map, and naming the unit of distance even more so. Two hundred stades make twenty-five Roman miles, about thirty-seven kilometres, which matches the voyage from the harbour of Boas to the island of Cythera, landing near Palaiopoli. Older research read it instead as the width of the gulf between two headlands, but the copy never makes clear which crossing is meant.