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The following is an encore presentation of Everything Everywhere Daily. The world as we know it is made up of 193 countries, Antarctica and a host of smaller territories. However, between all of those places are the high seas or international waters, which are not controlled by anybody. But where do international waters begin? What can you do in international waters and how close can you actually sail to another country? Learn more about the law of the sea, how it was created, and what it stipulates on this episode of Everything Everywhere Daily. This podcast is brought to you in part by Stash. So you want to start investing but have no idea where to begin? Stash makes it easy Stash isn't just another investing app. It's a registered investment advisor that combines automated investing with expert guidance so you don't have to worry about figuring it out on your own. You can choose from personalized investments or let Stash's award winning smart portfolio do the work for you. With Stash, investing doesn't feel like gambling. It's simple, smart and stress free so your money can finally start working as hard as you do. Get access to world class financial advice with personalized guidance for just a three dollar monthly subscription. Stash has already helped millions of Americans reach their financial goals. Don't let your money sit around. Put it to work with stash. Go to git.stash.com everything to see how you can receive $25 toward your first stock purchase and to view important disclosures. That's git.stash.com everything paid non client endorsement, not representative of all clients and not a guarantee. Investment Advisory Service is offered by Stash Investments LLC and SEC Registered Investment Advisor. Investing involves risk. Risk offer is subject to T's and C's. This episode is sponsored by Fiji Water. You've probably heard of Fiji Water and have seen it in stores. Well, Fiji Water really is from the islands of Fiji. Drop by drop. Fiji Water is filtered through volcanic rock 1,600 miles away from the nearest continent and all its pollution protected and preserved naturally from external elements. In this process, it collects a unique profile of electrolytes and minerals, resulting in more than double the electrolytes as the other top two premium bottled brands, giving Fiji Water its smooth taste. Fiji Water's electrolytes are 100% natural and this water even has a perfectly balanced pH of 7.7. I've recently been trying to reduce my consumption of diet soda and I've found Fiji Water to be a great alternative. Visit your local retailer to pick up some Fiji Water today for your next Backyard party, beach day hike, or even your home office. Fiji water is Earth's finest water. When humans first started sailing on the seas, there were effectively no rules on land. Kings and emperors wrote laws that could determine what could and couldn't be done. The sea, however, was a state of anarchy. And I do mean anarchy in the very literal sense of the word. There were no laws or rules governing what could happen on the high seas. And if there were, there were absolutely no ways to enforce them. Eventually, over time, customs and traditions were developed that covered nautical issues and maritime disputes. Becoming a sailor meant possibly years of training, which involved learning the customs and traditions developed for sailing on the high seas. I've done many episodes where some modern innovation or tradition actually began in ancient Rome. In the case of maritime law, that is not the case at all, which is actually rather odd. The Romans eventually controlled all the territory surrounding the Mediterranean Sea, yet they never developed any explicit set of laws regarding the high seas. They did have laws regarding shipping and insurance, but that was about it. That wasn't to say that the seas weren't important to Rome. They certainly were. Yet it never resulted in anything that you could call maritime law. The first thing that we can point to that would be an explicit maritime law would be. During the Byzantine Empire, they created a legal framework known as the Rhodian Sea Laws, or as it was known in Greek, the Nomos Rhodian Nauticos, which was written around the year 800. We're quite certain that it existed because there are many references to it in other texts. Unfortunately, there are no surviving samples of the Nomos Rodion nauticos in existence. What we can summarize is that the Nomos Rhodian nauticos probably dealt with shipping insurance and may have simply codified rules that the Phoenicians may have developed as early as 1000 BC. The oldest surviving text on maritime law is the Ordinamenta et Consututo Maris, which dates back to 1063. It was written in Trani, a significant trading port on the Adriatic Sea. It's a legal framework for resolving disputes and ensuring fair practices in maritime trade. There were other rules regarding shipping and maritime trade over the centuries, including the laws of Wisby, the rolls of Oral Aran, and many others. However, none of these actually dealt with the sea itself. They just dealt with ships that sailed on the sea. Also, none of these were treaties or agreements between countries. The big changes in the legal status of the See began during the Renaissance and the Age of Discovery. In particular, the 1494 Treaty of Tordesillas. The treaty between Spain and Portugal that basically divided the world into two between the two countries. The treaty was a modification of a papal bull issued by Pope Alexander VI issued the year before. The treaty created a line of demarcation about the 370 leagues, or approximately 1,770 kilometers, or 1,100 miles west of the Cape Verde Islands off the coast of Africa. Spain was given the rights to all lands west of the line, which included most of the Americas. Portugal was given the rights to all lands east of the line, which included parts of Africa, Asia and Brazil. And this treaty would have been great if you were Spain or Portugal. However, absolutely everybody else in the world had no incentive to honor the division of the world between these two countries. In particular, the Dutch developed a countervailing theory about the high seas. This view of the high seas was included in the 1609 book Mare Librum by the Dutch philosopher Hugo Grotius. Grotius argued that the sea should be treated like the air. It belonged to no one. The principle was based on the idea that every nation is free to travel to every other nation and to trade with it. Grotius was working for the Dutch East India Company when he wrote it and was making a philosophical case for why the Dutch should be allowed to sail to the East Indies. For ships from any nation to be able to travel, he argued they all had the right of what was called innocent passage. And here I should explain what innocent passage is, because it's still a fundamental pillar of international law today. Innocent passage is nothing more than the ability to sail from one point to the next without doing anything else. It does not include fishing, stopping, firing weapons, gathering data, conducting surveys, or anything. Grotius argument was not universally accepted, especially not by the English. The English legal scholar John Selden wrote a response to mare Liebrum in 1635. His book Mare Clauseum, or Closed Sea, argued that parts of the sea could be appropriated and defended as easily as land. Basically, he didn't like the idea of Dutch ships fishing right off the coast of England. Seldon's idea was expanded by the Dutch legal scholar Cornelius van binkershoek in the 1709 book Die Dominio Maris, or the Dominion of the Sea. He said that the range of a country's territory into the sea was effectively the range of its best weapons. And this was later calculated by the Italian Ferdinand Gallimi, who determined that the best guns of the era could shoot a cannonball approximately three nautical miles. This just coincidentally is about the same approximate distance that an adult can see to the horizon when standing on the shore. This position that most European countries came to accept in the 18th century became known as the three mile rule. Under this rule, any coastal waters within three nautical miles of the coast were considered the sovereign territory of the country that bordered them. And this also became known as the cannon shot rule. Due to how simple and intuitive it was. The ideas of Grotius, Selden and Van Binkershoek managed to form the basis of the international order on the seas. Basically, the high seas belonged to no one. But the seas within three nautical miles were part of the territory of the country that it was next to. There were some exceptions in particular places where you had to sail within three nautical miles of the shore to pass through a strait. Examples of this included the Straits of Magellan at the tip of South America and the Strait of Malacca between Singapore and Indonesia. The three mile zone was the generally agreed upon standard until the middle of the 20th century. Technical innovations made many of the past assumptions about international waters kind of moot. For starters, the distance a cannonball could fire was no longer relevant in a world with long range artillery. More countries began to proclaim their territorial waters extending out a longer distance. There was also suddenly an issue with oil and mineral rights in the seabed, Something which had never been an issue before. Another consideration was what to do about pollution. If there was an oil spill, for example, how would impacted countries be compensated and how would that all be defined? Likewise, fishing became much more intensive and the ability of ships to come and deplete a nation's fish stock became much more real. Before World War II, the League of nations called a conference to establish an international order for the sea, but nothing came of it. Progress didn't occur until after the war and the establishment of the United Nations. In fact, this area was considered to be one of the biggest reasons for the creation of the United Nations. A series of conferences were held regarding the law of the sea, the first of which took place in 1958 and the second in 1960. And this resulted in several treaties which were signed in the mid-1960s. A much more comprehensive agreement was negotiated over a period of almost a decade, from 1973 to 1982. The result of this was the United Nations Convention on the Law of the Seas, Superseding all of the other conventions. It didn't go into effect until it was ratified by its 60th country, which took place in 1994 when Guyana approved it. As of the day of this recording, 168 countries, plus the entire European Union are parties to the treaty. The treaty spells out three different maritime zones each country has on the sea. The first is the territorial sea. This is the zone where every country has full sovereignty over the waters closest to it, and this extends 12 nautical miles off the coast at low tide. Many countries changed their three nautical mile claims in the 20th century, and 12 nautical miles was the limit that was agreed upon. Extending 24 nautical miles from the shore is called the contiguous zone. The contiguous zone is just an area outside of territorial waters where certain laws can be enforced. For example, if a ship filled with contraband or illegal migrants was heading towards the shore, it could be stopped in the contiguous zone. Likewise, action could be taken if a ship was dumping waste in the contiguous zone. The final zone, which extends out 200 nautical miles from shore, is the exclusive economic zone or or EEZ. The EEZ is a much larger area reserved for economic uses by nearby countries, such as fishing, oil and gas exploration, and undersea mining. Underlining all of these different coastal zones is the principle of freedom of the seas. Freedom of the seas allows for the previously mentioned innocent passage through territorial waters. Innocent passage applies to all vessels and including warships. Different interpretations of innocent passage have caused incidents in the past, in particular during the Cold War, when one side or the other wanted to prove a point by sailing unusually close to the shore of the other country. I noted that most nations have ratified the Law of the Sea Convention. Most of the countries that haven't ratified it are landlocked, so it really doesn't matter, but there are a few exceptions. Turkey, Syria, Venezuela, and Peru have all not ratified the treaty. However, there's also one country that hasn't ratified it that really stands out, the United States of America. The US has never ratified the Law of the sea Convention. For 40 years, it has been rejected by multiple presidential administrations and Congresses, which have been controlled by both parties. The biggest argument has been that the US Feels that the Law of the Sea Convention takes too much control over the economic development of oil, gas and mineral resources out of the hands of the country. Despite not having ratified the treaty, the US does de facto adhere to almost everything else in the treaty. They just haven't formally ratified it. International law regarding the high seas is something that most people probably don't think much about yet. It is one of the most important parts of international law and international relations. Having a coherent system of international agreements that cover how the seas are used allows for much of the world's international trade and overall makes the world a much safer and prosperous place. The executive producer of Everything Everywhere Daily is Charles Daniel. The associate producers are Austin Otkin and Cameron Kiefer. My big thanks go to everyone who supports the show over on Patreon. Your support helps make this podcast possible, and I also want to remind everyone about the community groups on Facebook and Discord. That's where everything happens that's outside the podcast, and links to those are available in the show Notes. As always, if you leave a review on any major podcast app or in the above community groups, you too can have it read on the show.
Host: Gary Arndt
Date: September 27, 2025
In this encore episode, Gary Arndt explores the fascinating development of the "law of the sea"—the system of international agreements and traditions that governs how countries use and control the world's oceans. Moving from ancient custom to modern treaties, Arndt explains how maritime law evolved, why international waters exist, who controls them (and how far out that control goes), and the significance of these laws in our modern, interconnected world.
On the Absence of Roman Maritime Law
“In the case of maritime law, that is not the case at all, which is actually rather odd. The Romans… never developed any explicit set of laws regarding the high seas.”
— Gary Arndt, [04:10]
On the Problem with Treaty of Tordesillas
“This treaty would have been great if you were Spain or Portugal. However, absolutely everybody else in the world had no incentive to honor the division of the world…”
— Gary Arndt, [06:25]
Explaining Innocent Passage
“Innocent passage is nothing more than the ability to sail from one point to the next without doing anything else. It does not include fishing, stopping, firing weapons, gathering data, conducting surveys, or anything.”
— Gary Arndt, [07:55]
On the Three-Mile Rule
“This just coincidentally is about the same approximate distance that an adult can see to the horizon when standing on the shore. This position… became known as the three mile rule… also became known as the cannon shot rule due to how simple and intuitive it was.”
— Gary Arndt, [10:10]
On US Non-Participation in UNCLOS
“The US has never ratified the Law of the Sea Convention… despite not having ratified the treaty, the US does de facto adhere to almost everything else in the treaty. They just haven’t formally ratified it.”
— Gary Arndt, [18:05-18:40]
Gary Arndt’s episode skillfully traces how centuries of debate, conflict, and diplomacy forged today's maritime laws—rules that, though unseen by most, are vital for global trade, resource management, and international peace. The law of the sea, he argues, "is one of the most important parts of international law and international relations," allowing nations to share the world's oceans fairly and safely.
For further community discussion, Gary encourages listeners to join the podcast’s Facebook and Discord groups (links in show notes).