This is Sant’ Andrea della Zirada near the present Piazzale Roma (Nadali & Vianello (1999) Tav. 26). See Notebook M p.135; Notebook M2 p.32; Works, 11.362, and the footnote there on the change of title for the bas-relief described at Notebook M p.207. The note on its history at Notebook M2 p.32 is from Zanotto (1847) II.ii.179.
[Version 0.05: May 2008]