A section equals one square mile of land.
640 acres "section" |
320 acres "half-section" |
160 acres "quarter-section" |
80 acres "eighty" |
40 acres "forty" |

40 acres of land denoted by this dark green segment would
be described as the SE 1/4 of the SE 1/4 of Section 10.
| A survey township is a box of 36 square miles where the sections are designated by this numbering pattern. |
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