In Africa the most dangerous species include mambas, Egyptian cobras,puff adders, and carpet vipers; in the Middle East the species of greatest concern are carpet vipers and elapids;
In Central and South America, Bothrops (including the terciopelo or fer-de-lance) and Crotalus (rattlesnakes) are of greatest concern.
In South Asia it has historically been believed that Indian cobras, common kraits, Russell's viper and carpet vipers were the most dangerous species, however other snakes may also cause significant problems in this area of the world.