§ As used in this Treaty, the "treaty area" is the general area of South-East Asia, including also the entire territories of the Asian Parties, and the general area of the South-West Pacific not including the Pacific area north of 21 degrees 30 minutes north latitude. The Parties may, by unanimous agreement, amend this Article to include within the treaty area the territory of any State acceding to this Treaty in accordance with Article VII or otherwise to change the treaty area.