Birmingham Museum and Art Gallery
A number of Leonardo’s maps were made for projects in civil engineering or land management, a field in which he seems to have built up a significant reputation.
His most pictorial map centres on the long marshy lake that once occupied the Valdichiana in southern Tuscany. North is to the left, Perugia is at upper right, Arezzo at upper left and Siena lower centre. Although no scheme is shown, it was probably made in connection with a plan to drain the malarial marsh.