The king cobra (Ophiophagus hannah) is the world's longest venomous snake, with a length up to 5.6 m (18.5 ft). This species is widespread throughout Southeast Asia and parts of India, and is found mostly in forested areas. The king cobra can be fierce and agile, and can deliver a large quantity of highly potent venom in a single bite. It is one of the most dangerous and feared Asiatic snakes.
King Cobra is one of the most feared snakes in the world and with good reason. Although it is not the most poisonous snake in the world, it is definitely the longest poison snake around. It has enough venom in a single bite to take down an elephant and that should be reason enough to be afraid of it.
#2. Most of the most deadly snakes in the world. "Not only is this snake highly venomous, but it is the largest venomous snake found in Australia, with adults ranging in size from 6.5 to 12 feet in length. This snake also has the longest fangs of any venomous Australian snake; around 1/2 inch.