Section (United States land surveying)

In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid. == Description == The legal description of a tract of land under the PLSS includes the name of the state, name of the county, township number, range number, section number, and portion of a section.

Source: Wikipedia — Section (United States land surveying) (CC BY-SA 4.0)