Question: What type of law defines "states", and their role in an Exclusive Economic Zone?

Context paragraphs:
Cagayan Special Economic Zone: The Cagayan Special Economic Zone and Freeport, also known as Cagayan Freeport, is a special economic zone in Cagayan, northern Luzon, the Philippines.  It was established by virtue of Republic Act No. 7922, otherwise known as the Cagayan Economic Zone Act of 1995.  It is being supervised and managed by the Cagayan Economic Zone Authority (CEZA) into a self-sustaining industrial, commercial, financial, and recreational center, with a suitable residential area, in order to create employment opportunities around the Cagayan Freeport, and to effectively encourage and attract legitimate and productive local and foreign investments.

State Agency for Fisheries of Ukraine: The State Agency of Fisheries was established to implement the state policy in the fisheries field and fishing industry, protection, use and reproduction of aquatic biological resources, regulation of fisheries, maritime safety of fishing fleet vessels and to exercise its powers in the cases established by Ukrainian legislation on the territory of Ukraine in the exclusive (maritime) economic zone and on the continental shelf of Ukraine, as well as in the exclusive economic zones (in the fishing zones) of other states and in open ocean areas that are under the jurisdiction of international organizations on fisheries management, as well as in those that are outside of any jurisdiction according to the international agreements of Ukraine.

Tablas Economic Zone: Tablas Economic Zone is a special economic zone located in Tablas Island of Romblon, Philippines.  It was established in 2015 and being managed by Tablas Economic Zone Inc. (TEZI) under the umbrella of the Philippine Economic Zone Authority (PEZA) and the Department of Trade and Industry (DTI).

Isla Aves: Isla de Aves (Spanish for "Island of Birds" or "Birds Island"), or Aves Island, is a Caribbean dependency of Venezuela.  It has been the subject of numerous territorial disputes between the neighboring independent islands, such as Dominica, and European mother countries of surrounding dependent islands, such as the Netherlands.  It is part of the Aves Ridge and lies to the west of the Windward Islands chain at .  It is 375 m in length and never more than 50 m in width, and rises 4 m above the sea on a calm day.  Under a particular interpretation of the United Nations Convention on the Law of the Sea it could be classified as a rock, which would only give Venezuela a twelve nautical mile economic zone.  However, Venezuela claims it is an island, which grants it a 200 mi exclusive economic zone.  Mostly sand, a small portion has some scrubby vegetation.  It is sometimes completely submerged during hurricanes.  It is 185 km southwest of the closest land, Montserrat, 225 km west of Dominica and 547 km north of the Venezuelan mainland.

Exclusive economic zone of islands: Certain islands have an Exclusive Economic Zone (EEZ) around them, that is, an area within which the state governing the island has special rights to exploit marine resources.  In some cases, disputes between nations have arisen regarding the validity of zones that have been declared.

Indian Coast Guard: The Indian Coast Guard (ICG) protects India's maritime interests and enforces maritime law, with jurisdiction over the territorial waters of India, including its contiguous zone and exclusive economic zone.  The Indian Coast Guard was formally established on 18 August 1978 by the "Coast Guard Act, 1978" of the Parliament of India as an independent Armed force of India.  It operates under the Ministry of Defence.

Cod Wars: The Cod Wars (Icelandic: "Þorskastríðin" , "the cod strife," or "Landhelgisstríðin", "the war for the territorial waters") were a series of confrontations between the United Kingdom and Iceland regarding fishing rights in the North Atlantic.  Each of the disputes ended with Iceland's victory.  The final Cod War concluded in 1976 with a highly favourable agreement for Iceland, as the United Kingdom conceded to a 200 nmi Icelandic exclusive fishery zone following threats that Iceland would withdraw from NATO, which would have forfeited NATO's access to most of the GIUK gap, a critical anti-submarine warfare chokepoint during the Cold War.  As a result, British fishing communities lost access to rich areas and were devastated, with thousands of jobs lost.  Since 1982, a 200 nmi exclusive economic zone has been the United Nations standard.

Dizoniopsis coppolae: Dizoniopsis coppolae is a species of sea snail, a gastropod in the family Cerithiopsidae, which is known from European waters, including the Greek Exclusive Economic Zone, Portuguese Exclusive Economic Zone, South West Coast of Apulia,

Sovereign state: A sovereign state is, in international law, a nonphysical juridical entity that is represented by one centralized government that has sovereignty over a geographic area.  International law defines sovereign states as having a permanent population, defined territory, one government, and the capacity to enter into relations with other sovereign states.  It is also normally understood that a sovereign state is neither dependent on nor subjected to any other power or state.

Exclusive economic zone: An exclusive economic zone (EEZ) is a sea zone prescribed by the United Nations Convention on the Law of the Sea over which a state has special rights regarding the exploration and use of marine resources, including energy production from water and wind.  It stretches from the baseline out to 200 nautical miles (nmi) from its coast.  In colloquial usage, the term may include the continental shelf.  The term does not include either the territorial sea or the continental shelf beyond the 200 nmi limit.  The difference between the territorial sea and the exclusive economic zone is that the first confers full sovereignty over the waters, whereas the second is merely a "sovereign right" which refers to the coastal state's rights below the surface of the sea.  The surface waters, as can be seen in the map, are international waters.

Supporting paragraphs: Exclusive economic zone of islands Sovereign state
Answer: international law