What is the term for any of the north-south lines six miles apart that establish the boundaries of townships in the government survey system of land description?

The term that describes the north-south lines that are six miles apart, which help establish the boundaries of townships in the government survey system, is known as a meridian. In the context of the government survey system, meridians serve as reference points for identifying and organizing land parcels, facilitating the systematic mapping and division of land into townships.

Each meridian establishes a vertical division and works in conjunction with baselines, which run east-west and are also six miles apart. Understanding these terms is fundamental in surveying and land description methodologies, as they provide the framework within which land is measured, described, and assigned within the grid system used in the United States.