The Korean field mouse (Apodemus peninsulae), also known as the Korean wood mouse, is a species of mouse. It is distributed across Northeastern Asia, including the Russian Far East, northern China, the Korean Peninsula, Sakhalin, and Hokkaidà Â. It is not found on the Korean island of Jeju. The adult has a body length of 76âÂÂ125 mm, with a tail of nearly equal length (75âÂÂ112 mm).