The reason that Canada extended its territorial waters out to 200 nautical miles was to put a limit on cod fishing. Fishing was a major source of income for many people at that time.
12 nautical miles
India's territorial waters extend up to 12 nautical miles (22.2 km) from its coastline. Beyond this limit is the Exclusive Economic Zone of India, which extends up to 200 nautical miles (370.4 km) from the baseline.
Gibraltar's territorial waters are demarcated by a boundary extending three nautical miles from the coastline of the British Overseas Territory. This area includes the waters surrounding the Rock of Gibraltar and is subject to British sovereignty. The territorial waters are often a point of contention between the UK and Spain, as Spain claims sovereignty over Gibraltar but does not recognize the UK's territorial claims in the surrounding waters.
Iran's territorial waters extend all of the way to the center of the Persian Gulf (roughly 70 miles from the Iranian coast).
The U.S. has territorial waters that extend 12 nautical miles from its coastline, where it has control over activities including fishing and navigation. Beyond that, the U.S. has an exclusive economic zone that extends 200 nautical miles, where it has rights to explore, exploit, and manage natural resources. However, the sea itself is considered international waters and is not owned by any one country.
Territorial waters extend 22.2 km away from the coast, but the exclusive economic zone extends 370.8 km.
24 miles as of 1999 but the economic zone extends out to 200 miles
The Philippine internal waters as well as waters outside the baseline (per archipelago doctrine) but within the extent of the international treaty limits comprise the Philippines' territorial waters.
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.
That depends on that countries coastline. An Exclusive Economic Zone (EEZ) can start from the end of a countries territorial waters to 200 nautical miles out.
International waters, also known as the high seas, begin 12 nautical miles (approximately 22.2 kilometers) from a country's coastline. Within this 12-nautical-mile zone, a nation has sovereignty over its territorial waters. Beyond this limit, the waters are considered international, where no single nation has jurisdiction, allowing for free navigation and fishing, subject to international law.