What is a base line in the rectangular government survey system?

In the rectangular government survey system, a base line is defined as an east-west line used as a reference point for the organization of land. This system divides land into townships and ranges, where the base line runs horizontally (east-west) and is paired with principal meridians that run vertically (north-south). The base line serves as a fundamental starting point for surveyors to create a grid for land descriptions, helping in the identification and mapping of parcels of land.

This system enhances clarity and is especially useful in large-scale land surveys, making it easier to locate specific areas. The terminology associated with the rectangular survey system is crucial in real estate for accurate property descriptions. The other options pertain to different aspects of land use and management but do not accurately describe the foundational role of a base line in this survey system.