Rivers on three sides of the analysis
The rivers that make Rome worth looking at also put flood mapping into more of its appraisals than in any other city I serve. Whether a property sits in a mapped flood zone, and which one, affects what buyers will pay and what carrying it costs, and near the confluence the answer changes street by street. It is a checkable fact, so I check it on every riverside assignment rather than assuming the absence of a problem.
Rome also famously claims its seven hills, and the practical meaning for valuation is topography: lots that step, drop, or perch in ways flat-county appraising never has to think about. Two listings with identical bedroom counts can differ meaningfully in usable yard, access, and buildable ground, and none of that appears in a listing sheet. It appears at an inspection.