The perimeter of this park is about 2 kilometers.
We'll measure the outer circumference to decide the length of the fence.
Refers to the outer area or edge of a place, such as a city or facility. Often used in compound phrases like 外周部 (peripheral area).
The factory is on the outskirts of the city.
The scenery is nice when you drive along the peripheral road.
Compound of 外 (outside) and 周 (circumference, perimeter). The reading is on'yomi.