is a Quasi-National Park in Ōita and Miyazaki Prefectures, Japan. Established in 1965, the park derives its name from Mount Sobo () and (). The Quasi-National Park borders two homonymous Prefectural Parks, namely the Sobo Katamuki Prefectural Natural Park (Ōita) and Sobo Katamuki Prefectural Natural Park (Miyazaki).