Rhabdophis is a genus of snakes, generally called keelback snakes, found primarily in southeast Asia. While the term "poisonous snake" is often used for a wide variety of venomous snakes, some species of Rhabdophis are in fact poisonous. While both venom and poison are toxins, a venom requires direct delivery—for instance intravenously through a snake bite—but can be ingested without harm. A poison can also be absorbed indirectly, e.g. by touch or through the digestive system.