What do you call a parcel of land that is less than 160 acres, usually located at the edge of a rectangular survey?

A parcel of land that is less than 160 acres and typically located at the edge of a rectangular survey is referred to as a fractional section. This term is used in the context of the Public Land Survey System (PLSS), which divides land into sections that are generally one square mile or 640 acres. However, when these sections are incomplete or only partially available—especially at the boundaries of a surveyed area—they are termed fractional sections. This designation recognizes that the land does not conform to the standard section size due to geographical, man-made, or administrative constraints.

The other terms provided do not accurately describe this specific type of land parcel. A quadrant usually refers to one-fourth of a mapped area, a commercial plot generally references land designated for business purposes, and a subdivided tract typically pertains to land that has been divided into smaller lots, but not necessarily in accordance with the rectangular survey system constraints. Thus, the correct terminology for land parcels under those specific conditions is fractional section.