Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ebe: D. russelii dị na India, Sri Lanka, Bangladesh, Nepal, Myanmar, Thailand, Pakistan, Cambodia, Tibet, China (Guangxi, Guangdong), Taiwan na Indonesia (Endeh, Flores, ọwụwa anyanwụ Java, Komodo, na Lomblen Islands). A na-edepụta ụdị ebe ahụ dị ka "India". Karịsịa, nke a ga-abụ oke osimiri Coromandel, site na nkwubi okwu nke Russell (1796).Brown (1973) kwuru na enwere ike ịchọta ya na Vietnam, Laos, na agwaetiti Indonesian nke Sumatra. A kọrọ na Ditmars (1937) natara otu ụdị site na Sumatra, kwa. Otú ọ dị, a ka na-enyocha nkesa nke ụdị a n'agwaetiti ndị dị n'Indonesia. N'ime ebe ọ na-agbasa, ọ pụrụ ịbụ ihe a na-ahụkarị n'ebe ụfọdụ, ma dị ụkọ n'ebe ndị ọzọ. N'India, ọ bara ụba na Punjab, nke a na-ahụkarị n'akụkụ ụsọ oké osimiri ọdịda anyanwụ na ugwu ya, na ndịda India na n'ebe ugwu ruo Bengal. Ọ bụghị ihe a na-ahụkarị na ndagwurugwu Ganges, n'ebe ugwu Bengal, na Assam. Ọ na-ewu ewu na Myanmar. A na-ahụkarị ya na Thailand na Pattaya na n'obodo ndị ọzọ a na-eme njem nleta, bụ́ ebe òké, bụ́ anụ ndị bụ́ isi ọ na-eri, na-enwe nri n'ụba.  Ajụjụ: Olee ebe ị ga-ahụ D. russelii?
India, Sri Lanka, Bangladesh, Nepal, Myanmar, Thailand, Pakistan, Cambodia, Tibet, China (Guangxi, Guangdong), Taiwan na Indonesia