Dangerous snakes can be found all over the world, and there are several species that are particularly dangerous. The COPPERHEAD is a venomous snake found in North America, with a length of up to three feet. The BOA is a large, non-venomous snake found in tropical regions, and it can grow up to 13 feet long. The ADDER is a venomous snake found in Europe and Asia, and it can reach lengths of up to four feet. The rattler is a venomous snake found in North America, and it can grow up to six feet long. Finally, the ASP is a venomous snake found in Africa and the Middle East, and it can reach lengths of up to four feet. All of these snakes are considered dangerous and should be avoided.