Boundaries of state plane zones usually follow which feature?

• A. County lines.
• B. River basins.
• C. International borders.
• D. Mountain ridges.

Answer: (A)

State Plane zones are defined to keep distortion small within a defined geographic area, and their boundaries are drawn to align with existing political or jurisdictional units so that maps and legal land descriptions line up with official records. County lines are the most common boundary feature because land parcels and property records are typically organized by county, making it straightforward to relate surveys to the management and documentation people rely on. River basins, international borders, and mountain ridges don’t provide the stable, widely used framework that counties do for cadastral data and surveying workflows, so they aren’t the typical boundaries for these zones.