31 CFR 515.207 : Money And Finance: Treasury (§ 0.101 To Parts 1061-1099) — (Part 500 To Parts 1061-1099) — Regulations Relating To Money And Finance (Continued) (Part 500 To Parts 1061-1099) — Office Of Foreign Assets Control, Department Of The Treasury (Part 500 To Appendix A To Chapter V) — Cuban Assets Control Regulations (§ 515.101 To § 515.901) — Prohibitions (§ 515.201 To § 515.208) — Entry of vessels engaged in trade with Cuba.

Except as specifically authorized by the Secretary of the Treasury (or any person, agency or instrumentality designated by him), by means of regulations, rulings, instructions, licenses or otherwise,

(a) No vessel that enters a port or place in Cuba to engage in the trade of goods or the purchase or provision of services, may enter a U.S. port for the purpose of loading or unloading freight for a period of 180 days from the date the vessel departed from a port or place in Cuba; and

(b) No vessel carrying goods or passengers to or from Cuba or carrying goods in which Cuba or a Cuban national has an interest may enter a U.S. port with such goods or passengers on board.