Аннотация:PROTOBOTHROPS JERDONII (Jerdon’s Lance-headed Pitviper). VIETNAM: HA GIANG PROVINCE: Vi Xuyen District: Cao Bo Commune (ca. 22.77667°N, 104.81472°E; WGS 84), 1700 m elev. 6 April 2020. H. V. Mai. Verified by Gernot Vogel. Herpetological Collection, Duy Tan University (DTU 520; photo voucher). Individual found at ca. 1730 h near waterfall; surrounding habitat consisted of montane forests. First record for Ha Giang Province and this locality currently represents the easternmost distribution limit in Vietnam, ca. 430 km ENE of nearest known population in Fan Si Pan Mountain, Sa Pa District, Lao Cai Province, northwest Vietnam (Orlov et al. 2001. Russian J. Herpetol. 8:159–164). This species is known from northeast India, Nepal, southwest China, northern Myanmar, and northwest Vietnam (Guo et al. 2011. J. Biogeogr. 38:2326–2336). We are grateful to H.V. Mai (Ha Noi) for providing photo and information.