Oocatochus

Oocatochus is a genus of snake in the family Colubridae that contains the sole species Oocatochus rufodorsatus. It is known as the Chinese garter snake, frog-eating rat snake, or red-backed rat snake.
It is found in East Asia, in eastern China, Korea, and Russia. The Reptile Database also mentions Taiwan, but other sources do not support this.