A/HRC/40/18 III. Thirty-ninth session of the Human Rights Council 29. At the thirty-ninth session of the Human Rights Council, the following 17 special procedure mandate holders, including holders of 13 thematic and 4 country mandates, presented their annual reports: • Independent Expert on the promotion of a democratic and equitable international order • Special Rapporteur on the implications for human rights of the environmentally sound management and disposal of hazardous substances and wastes • Special Rapporteur on the rights of indigenous peoples • Working Group on mercenaries • Independent Expert on the enjoyment of all human rights by older persons • Special Rapporteur on the right to development • Special Rapporteur on contemporary forms of slavery • Special Rapporteur on the promotion of truth, justice, reparation and guarantees of non-recurrence • Special Rapporteur on the negative impact of unilateral coercive measures on the enjoyment of human rights • Special Rapporteur on the human rights to safe drinking water and sanitation • Working Group on Arbitrary Detention • Working Group on Enforced or Involuntary Disappearances • Working Group of Experts on People of African Descent • Special Rapporteur on the situation of human rights in Cambodia • Independent Expert on the situation of human rights in the Central African Republic • Independent Expert on the situation of human rights in Somalia • Independent Expert on the situation of human rights in the Sudan 30. Special procedure mandate holders also presented reports on their visits to 19 countries and territories: Argentina, Denmark and Greenland, Ecuador, Gambia, Georgia, Ghana, Guatemala, Guyana, India, Mexico, Mongolia, Montenegro, Paraguay, Sierra Leone, Spain, Sri Lanka, Syrian Arab Republic, Venezuela (Bolivarian Republic of) and the European Union. The Working Group on Enforced and Involuntary Disappearances presented a report in follow-up to its missions to Croatia, Montenegro, Serbia and Kosovo. 31. The Special Rapporteur on the rights of indigenous peoples presented a summary, jointly prepared with the Rapporteur on the Rights of Indigenous Peoples of the InterAmerican Commission on Human Rights, of a working meeting on the rules of international law relating to the human rights of indigenous peoples in voluntary isolation and initial contact in the Amazon and the Gran Chaco. 32. The Working Group on Arbitrary Detention presented a report on revisions to its methods of work. The Working Group on Enforced and Involuntary Disappearances, for its part, submitted a report on enforced disappearances in the context of migration. The Special Rapporteur on the promotion of truth, justice, reparation and guarantees of non-recurrence presented a global study on transitional justice. 33. The special procedure mandate holders also presented their communications report, which contained the communications sent by all mandate holders between 1 March and 31 May 2018. 6