Leading down to the Thames from the bank just north of Whitehall Palace. Pepys describes them as being “in Chanel Row” so, judging by this map from 1746 it’s possible they’re the same stairs then known as Manchester Stairs. That’s what we’ve assumed for their map location here.
The overlays that highlight 17th century London features are approximate and derived from Wenceslaus Hollar’s maps:
Open location in Google Maps: 51.501592, -0.123653
Chart showing the number of references in each month of the diary’s entries.