[Alberta's Child]

The disputes over the Strait of Hormuz are probably the primary reason why Iran has never ratified UNCLOS.

Neither has the U.S., for that matter.

[Magnum44]

No, but the US has enforced freedom of navigation and ‘law of the sea’ since the days of the Barbary pirates. Like our modern constitutional law stems from British common law, which stems from Biblical law, the UNCLOS stems from earlier accepted common law that civilized peoples know is a requisite for civilized society.