This species is endemic to Lanyu Island, also known as "Orchid Island" or “Botel Tobago”, which is located off the southeastern coast of Taiwan. It is restricted to the southeastern part of the island. Its area of occupancy is only 3 km² ^{and its extent of occurrence is only 7 km² and it has an elevation range between 5 and 50 m above sea level (H. Ota pers. comm.).}