What is the name of the lines that are six miles apart and parallel to the baseline?

The correct answer is identified as township lines. These lines are established as part of the Public Land Survey System (PLSS) and serve a critical role in land surveying and mapping in the United States. Township lines run parallel to the baseline and are used to create a grid system for land division. They are typically spaced six miles apart, creating a series of horizontal divisions across the landscape.

This system of township lines, combined with range lines—which are set six miles apart running perpendicular to township lines—facilitates the organization of land into townships, which measure six miles by six miles. The precise alignment and regular spacing of these lines ensure consistency in land measurements and serve as a foundation for legal property descriptions.

Understanding the function and arrangement of township lines is essential for accurately interpreting maps, property descriptions, and land surveys. This knowledge is particularly pertinent for professionals engaged in real estate, land management, and various forms of engineering related to land use.