was that the Canal Zone, as an entity, ceased to exist on October 1, 1979. The final phase of the treaty was completed on December 31, 1999. On this date, the United States relinquished control of the Panama Canal and all areas in what had been the Panama Canal Zone. As a result of the treaties, by the year 2000 nearly , including some 7,000 buildings, such as military facilities, warehouses, schools, and private residences, were transferred to Panama. In 1993, the Panamanian government created a temporary agency (Autoridad de la Región Interoceánica or "Interoceanic Region Authority", commonly referred to as ARI) to administer and maintain the reverted properties. On the day the treaty took effect, most of the land within the former Canal Zone transferred to Panama. However, the treaty set aside many Canal Zone areas and facilities for transfer during the following 20 years. The treaty specifically categorized areas and facilities by name as "Military Areas of Coordination", "Defense Sites" and "Areas Subject to Separate Bilateral Agreement". These were to be transferred by the U.S. to Panama during certain time windows or simply by the end of the 243-month treaty period. On October 1, 1979, among the many such parcels so designated in the treaty, 34 emerged as true enclaves (surrounded entirely by land solely under Panamanian jurisdiction). In later years as other areas were turned over to Panama, eight more true enclaves emerged. Of these 42 true enclaves, 14 were related to military logistics, seven were military communications sites, five Federal Aviation Administration facilities, five military housing enclaves, three military base areas, two military research facilities, four secondary school parcels, one elementary school, and one hospital. At least 13 other parcels each were encircled not only by land under the absolute jurisdiction of Panama, but also by an "Area of Civil Coordination" (housing) that was subject to elements of both U.S. and Panamanian public law under the treaty. In addition, the treaty designated numerous areas and individual facilities as "Canal Operating Areas" for joint U.S.–Panama ongoing operations by a commission. On the effective date of the treaty, many of these, including Madden Dam, became newly surrounded by the territory of Panama. Just after noon local time on 31 December 1999, all former Canal Zone parcels of all types had come under the exclusive jurisdiction of Panama. In literature Graham Greene attended the signing with Gabriel Garcia Marquez.