古坂峠は古坂峠は兵庫県篠山市の県道12号川西篠山線にある城東トンネル旧道。 峠より南側は比較的状態が良いが、北側は荒れ放題で、廃道状態である。
Kogasaka Pass is a former road of Seongdong tunnel located in Kasai Shinoyama Line No. 12 of Sasayama-shi, Hyogo Prefecture. Although the state is relatively good on the south side of the pass, the northern side is all you can do for the desolation, and it is in the state of disused road.