Law or judicial body having to do with, or jurisdiction over, shipping and the sea.
In reference to the body of law, some jurisdictions prefer the plain language term maritime law and, historically, the domain was also referred to as marine law.
As shipping and transportation by sea of goods and passengers is a unique and complex area of the law, chock full of tradition and international law overtones, esoteric to those familiar only to domestic law, responsibility for its implementation and enforcement is frequently given to a specialized bench or an admiralty court.
References and Further Reading:
United Nations Convention on the Law of the Sea, December 10, 1982, published at un.org/Depts/los/convention_agreements/texts/unclos/UNCLOS-TOC.htm