Part of Dalseong County, it is separated from the urban center of Daegu by the ridgelines of Yongjibong and Apsan.

These two mountains are separated by the narrow valley of the Sincheon, a tributary of the Nakdong which drains most of the township.

This rugged topography makes it a favored destination for outings, both for mountain climbers and for those seeking only to enjoy the resort facilities in the Naengcheon valley.

To the south, Gachang is equally isolated by a line of low mountains that lie between it and Cheongdo county in Gyeongsangnam-do.

Gachang-myeon is the site of a major water supply facility for Daegu, the Gachang Dam.