San Vittorino Sector A pairs the Pantano di Granaraccio and Tenuta di Corcolle in the north with the Valle di Castiglione and Piano di Castiglione in the south.
Source: Old map, public domain
A blue canal slants down from the top-left corner past the marsh. Boundaries with Tivoli, Zagarolo, Montecompatri and Gallicano nel Lazio frame the area, and a note at the right shows that Sector B continues.