Elaphe anomala, commonly known as the Korean rat snake, southern Amur ratsnake, or as gureong-i (구렁이) in the Korean language, is a non-venomous species of colubrid snake known from China and Korea. It was formerly considered to be a subspecies of Elaphe schrenckii, the Amur ratsnake. It is a semi-arboreal snake that can be found in grasslands, dry scrub, rocky areas, and on the banks of rivers and lakes. It grows to 150–180 cm (59–71 in).