Gachang-myeon is a myeon, or township in rural southeastern Daegu, South Korea. Part of Dalseong County, it is separated from the urban center of Daegu by the ridgelines of 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. The valley of the Sincheon also hosts the only roads that connect Gachang to central Daegu. To the south, Gachang is equally isolated by a line of low mountains that lie between it and Cheongdo county in Gyeongsangnam-do. Here the ridgeline is broken by the pass of Paljoryeong.