Zone of Application, Art. 4
The Treaty of Tlatelolco, in its Article 4, delineates its Zone of Application as the whole of the territories for which the Treaty is in force. In addition, it specifies that:
Upon fulfillment of the requirements of Article 29, paragraph 1, the Zone of Application of this Treaty shall also be that which is situated in the western hemisphere within the following limits (except the continental part of the territory of the United States of America and its territorial waters): starting at a point located at 35º north latitude, 75º west longitude; from this point directly southward to a point at 30º north latitude, 75º west longitude; from there, directly eastward to a point at 30º north latitude, 50º west longitude; from there, along a loxodromic line to a point at 5º north latitude, 20º west longitude; from there, directly southward to a point at 60º south latitude, 20º west longitude; from there, directly westward to a point at 60º south latitude, 115º west longitude; from there, directly northward to a point at 0º latitude, 115º west longitude; from there, along a loxodromic line to a point at 35º north latitude, 150º west longitude; from there, directly eastward to a point at 35º north latitude, 75º west longitude.
Therefore, the Zone of Application defined by the Treaty of Tlatelolco encompasses a surface of more than 20 million square kilometers. It includes areas of the high seas, defined by the United Nations Convention on the Law of the Sea, and the national territories of the 33 countries of Latin America and the Caribbean, home to more than 600 million people. The Treaty of Tlatelolco does not extend nor does is claim sovereignty of the aforementioned high seas regions for the States Parties, it establishes them as nuclear-weapon-free in accordance with Additional Protocol II of the Treaty.