Mauritania's out-going President Mohamed Ould Abdel Aziz looks on during the swearing-in ceremony of the newly-elected Mauritania's President at a conference center in Nouakchott, on August 1, 2019. - Mauritania, roiled by a history of military coups and upheaval, saw its first transfer of power between elected leaders on August 1, 2019 as President Mohamed Ould Abdel Aziz handed over to his successor. Mohamed Ould Cheikh El Ghazouani was sworn in at a conference centre near the capital Nouakchott before a crowd of 5,000 people. (Photo by Seyllou / AFP)