The eddy made by the Mensola, when the Arno is low and the Mensola full.
[Footnote: Mensola is a mountain stream which falls into the Arno about a mile and a half above Florence.
A=Arno, I=Isola, M=Mvgone, P=Pesa, N=Mesola.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.