Eup (administrative division)
An eup or ŭp (Korean: 읍) is an administrative unit in both North Korea and South Korea similar to the unit of town. == In South Korea == Along with "myeon", an "eup" is one of the divisions of a county ("gun"), and of some cities ("si") with a population of less than 500,000.
Source: Wikipedia — Eup (administrative division) (CC BY-SA 4.0)