Distribution of Ophryophryne species in southern Indochina (Langbian Plateau in Vietnam, and adjacent regions of Camodia), indicating localities sampled in this study. Black dot in the center of an icon indicates the type locality of the new species. Locality information. 1 O Chung Chry stream, Samling Logging Concession, O’Rang Dist., Mondolkiri Prov., Cambodia (500 m a.s.l.) (Stuart et al. 2006; type locality of O. synoria; Mahony et al. 2017) 2 Bu Gia Map N.P., Binh Phuoc Prov., Vietnam (400 m a.s.l.) (Vassilieva et al. 2016; this study) 3 Nam Cat Tien sector of Dong Nai Biosphere Reserve, Dong Nai Prov., Vietnam (200 m a.s.l.) (Vassilieva et al. 2016; this study) 4 Loc Bac forest, Bao Loc Dist., Lam Dong Prov., Vietnam (830 m a.s.l.) (this study) 5 Cam Ly River (Ohler 2003: type locality of O. gerti) and Nui Ba Mt. in environs of Dalat city, Lam Dong Prov., Vietnam (ca. 1000–1800 m a.s.l.) (this study) 6 Environs of Bidoup Mt. (2000 m a.s.l.), and Giang Ly Ranger Station (1500 m a.s.l.), Bidoup–Nui Ba N.P., Lam Dong Prov., Vietnam (Poyarkov [Paiarkov] and Vassilieva 2011; this study) 7 Hon Giao Mt., Bidoup–Nui Ba N.P., Lam Dong and Khanh Hoa provincial border, Vietnam (1900–2000 m a.s.l.) (this study) 8 Hon Ba Mt., Hon Ba N.R., Dien Khanh Dist., Khanh Hoa Prov., Vietnam (950–1510 m a.s.l.) (Nguyen et al. 2014; this study) 9 Nui Chua Mt., Nui Chua N.P., Ninh Hai Dist., Ninh Thuan Prov., Vietnam (780 m a.s.l.) (this study) 10 Chu Pan Fan Mt., Chu Yang Sin N.P., Lak Dist., Dak Lak Prov., Vietnam (1900 m a.s.l.) (type locality of Ophryophryne elfina sp. n.; this study) 11 Chu Yang Sin Mt. environs, Krong Kmar Commune, Krong Bong Dist., Dak Lak Prov., Vietnam (700–2000 m a.s.l.) (Orlov et al. 2008; this study) 12 Tay Hoa Dist., Phu Yen Prov., Vietnam (700 m a.s.l.) (this study).