What geographic region of Virginia has the least impact on water quality of chesapeake bay?

The geographic region of Virginia that has the least impact on water quality of the Chesapeake Bay is likely the western part of the state, specifically the Appalachian region. This area is characterized by mountainous terrain and less urban development compared to the eastern coastal regions. As a result, there is less runoff carrying pollutants into the Bay from this area, leading to a lower impact on water quality.