It borders Sep'o to the north, Ch'ŏrwŏn to the south, Ich'ŏn to the west, and Kimhwa to the east.

A portion of the county is occupied by the Ryongam wetlands, which also cross into Ch'ŏrwŏn.

Most of the county's terrain is mountainous, although there a few small expanses of level ground.

[citation needed] The P'yŏnggang area was known as Puyang hyŏn during the Koguryŏ period, and as Kangp'yŏng (강평) under Silla.

In addition, the mines of P'yŏnggang extract gold, tungsten, nepheline, zircon, alunite, and diatomaceous earth.