The primary survey line running east and west in the rectangular survey system is the?

In the rectangular survey system, the primary survey line running east and west is known as the base line. The base line serves as a reference point from which townships are designated north or south. Each base line has a corresponding principal meridian, which runs north and south and is used to create a grid of townships.

In this system, townships are typically organized in six-mile square sections, and the base line is essential for laying out these sections in relation to the earth's surface. It provides a systematic way to identify and map land parcels in a specific geographical area, ensuring uniformity and clarity in land descriptions.

The understanding of these terms is fundamental for anyone involved in land valuation as it establishes the framework for legal descriptions, property lines, and the organization of land into manageable units. This knowledge is particularly relevant when interpreting land surveys, conducting property appraisals, or engaging in real estate transactions.