On 1 October 1979, the day the Panama Canal Treaty of 1977 took effect, most of the land within the former Canal Zone was 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 1 October 1979, among the many such parcels so designated in the treaty, 35 emerged as enclaves (surrounded entirely by land solely under Panamanian jurisdiction). In later years as other areas were turned over to Panama, nine more enclaves emerged.