UNCLOS III

United Nations Convention on the Law of the Sea

Logo of the Convention
Signed	10 December 1982
Location	Montego Bay, Jamaica
Effective	16 November 1994
Condition	60 ratifications
Signatories	157
Parties	168
Depositary	Secretary-General of the United Nations
Languages	Arabic, Chinese, English, French, Russian, and Spanish
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The United Nations Convention on the Law of the Sea (UNCLOS), also called the Law of the Sea Convention or the Law of the Sea treaty, is the international agreement that resulted from the third United Nations Conference on the Law of the Sea (UNCLOS III), which took place between 1973 and 1982. The Law of the Sea Convention defines the rights and responsibilities of nations with respect to their use of the world's oceans, establishing guidelines for businesses, the environment, and the management of marine natural resources. The Convention, concluded in 1982, replaced four 1958 treaties. UNCLOS came into force in 1994, a year after Guyana became the 60th nation to ratify the treaty. As of June 2016^[update], 167 countries and the European Union have joined in the Convention. It is uncertain as to what extent the Convention codifies customary international law.

While the Secretary General of the United Nations receives instruments of ratification and accession and the UN provides support for meetings of states party to the Convention, the UN has no direct operational role in the implementation of the Convention. There is, however, a role played by organizations such as the International Maritime Organization, the International Whaling Commission, and the International Seabed Authority (ISA). (The ISA was established by the UN Convention.)

UNCLOS replaces the older 'freedom of the seas' concept, dating from the 17th century: national rights were limited to a specified belt of water extending from a nation's coastlines, usually 3 nautical miles (5.6 km) (Three-mile limit), according to the 'cannon shot' rule developed by the Dutch jurist Cornelius van Bynkershoek. All waters beyond national boundaries were considered international waters: free to all nations, but belonging to none of them (the mare liberum principle promulgated by Hugo Grotius).