Elaphe davidi
Habitat
Forest and grassland, 100–900 m; also orchards
Range
Mainly north-eastern China, south to Hebei and Shanxi
Pere David's rat snake (Elaphe davidi) is a colubrid native to East Asia, found mainly in China, where the Reptile Database lists Hebei, Shanxi, Beijing, Heilongjiang, Liaoning, Inner Mongolia and Shandong. Its presence in North Korea is uncertain. (The Reptile Database; Wikipedia, general species account)
Its preferred habitats are forest and grassland at 100–900 m, and it has also been found in agricultural areas such as orchards. (Wikipedia, general species account)