Vipera berus sachalinensis

Vipera berus sachalinensis (Sakhalin Island adder a.k.a. Sakhalin adder ) is a viper subspecies endemic to Asia. Like all other vipers, it is venomous.

Geographic range
It is found in the Russian Far East (Amur), China (Jilin), North Korea, and on Sakhalin Island.

According to Schwarz (1936), the type locality is "Sachalin" (= Sakhalin Island, Russia).

Taxonomy
McDiarmid et al. (1999) follow Golay et al. (1993) and recognize V. b. sachalinensis as a subspecies of V. berus. However, it has been considered a full species in recent literature.