The Bureau noted that state of conservation reports of three of the fifteen natural heritage properties inscribed on the List of World Heritage in Danger, namely Srebarna Nature Reserve (Bulgaria), the Everglades National Park and Yellowstone National Park (United States of America) are due by 15 September 1999 and will be submitted to the twenty-third ordinary session of the Committee, to be convened from 29 November to 4 December 1999 in Marrakesh, Morocco. The Bureau examined the state of conservation reports on the following twelve natural heritage sites included in the List of World Heritage in Danger.