A Sea snake, or "coral reef snake", is a venomous elapid snake. They live in marine environments for most or all of their lives. At present, 17 genera are described as sea snakes, with 62 species.
They evolved from snakes that lived on the land. Some sea snakes still have some of the behaviour and traits of their ancestors, such as Laticauda, which can move a little on land. Most sea snakes are unable to move on the ground at all, but they are well adapted to living in the water.
Sea snakes are found in warm coastal waters from the Indian Ocean to the Pacific. They live in the tropical and warm regions, but not in the Atlantic Ocean, or the North American coast above the Gulf of California.