Of course it should go without saying that whenever features with unknown boundaries like these are displayed on a map, especially if they are combined with high‑resolution personal data such as parcel boundaries, a caveat needs to be made to such effect in the title, subtitle, or some other prominent location. (See Figures 6.33 through 6.36 for examples.) If the graphics cannot convey the message, then the words can (and vice versa), but try for both.