12 nautical miles or about 14 statute miles from the outermost points of land at low tide
International waters, also known as the high seas, begin 12 nautical miles (about 13.8 miles or 22.2 kilometers) from the baseline of a coastal state. From Galveston, Texas, this means that you would need to travel at least 12 nautical miles offshore into the Gulf of Mexico to reach international waters. Anything beyond this distance is not subject to the jurisdiction of any particular country.
Federal waters in the United States extend 200 nautical miles (approximately 230 miles or 370 kilometers) from the coastline. This area is known as the Exclusive Economic Zone (EEZ), where the federal government has special rights regarding the exploration and use of marine resources. Beyond the EEZ, the waters are considered international waters, where no single nation has jurisdiction.
International waters are about 50 miles away from any countrys shore line. Once in international waters do what ever you want make your own laws. International waters do not start till 200 miles from the United States Coast Line and you still better not try and do what ever you want.
I believe that state waters in Florida, Texas, and Puerto Rico extend out to 9 miles with the exception of the Atlantic side of Florida where it ends at 3 miles. Federal waters end at 12 nautical miles offshore of the US. HOWEVER, there is a 24 mile US contiguous zone and a 200 mile exclusive economic zone in which some laws still do apply. If you are planning on doing something sketchy, go really far offshore or talk to a lawyer.
Puerto Rico is an island therefore it does not have a land border with any other country. The Dominican Republic is 90 miles to the west of Puerto Rico across the Mona Straight. That is the only foreign country that is even close to sharing a border with Puerto Rico. And since the US Territorial Waters only extend 12 nautical miles, the island's territorial waters do not border with any other country. The US Virgin Islands are about 50 miles to the East of the Puerto Rican coastline. Puerto Rico and the US Virgin Islands are both territories if the United States so there is no national border there even in the territorial waters they share. The US Virgin Island's territorial Waters border the British Virgin Islands Territorial waters. That would be the nearest international boundary to Puerto Rico.
International waters are about 50 miles away from any countrys shore line. Once in international waters do what ever you want make your own laws. International waters do not start till 200 miles from the United States Coast Line and you still better not try and do what ever you want.
International waters, also known as the high seas, typically begin 12 nautical miles (about 13.8 miles or 22.2 kilometers) from a country's coastline. Off the coast of Louisiana, this means that international waters start approximately 12 nautical miles from the state’s shoreline. Beyond this limit, the waters are not under the jurisdiction of any single nation.
Depend on location, 3-250 miles
In the Gulf of Mexico, it is generally 7-10 miles offshore. I think that 12 is the global standard,
The border between Canada and the United States is the longest international border in the world, stretching over 5,500 miles.
The Gulf of Tonkin is considered international waters, but it is adjacent to the territorial waters of Vietnam and China. Under international law, countries have sovereignty over waters extending 12 nautical miles from their coastlines, while the remainder is classified as international waters. The Gulf of Tonkin has been a point of geopolitical tension, especially during the Vietnam War, but it remains largely open to navigation by all nations.
The Texas-Mexican border is approximately 1254 sq. miles.