Which of the following types of eels inhabits the largest territory?

Moray eels are a family of eels whose members are found worldwide. The approximately 200 species in 15 genera are almost exclusively marine, but several species are regularly seen in brackish water, and a few are found in fresh water.

The English name, from the early 17th century, derives from the Portuguese 'moréia', which itself derives from the Latin 'mūrēna', in turn from the Greek 'muraina', a kind of eel.

Although the moray eel can occupy both tropical oceans and temperate oceans, as well as both freshwater and saltwater, the majority of moray eels occupy warm saltwater environments, which contain reefs. Within the tropical oceans and temperate oceans, the moray eel occupies shelters, such as dead patch reefs and coral rubble rocks, and less frequently occupies live coral reefs.