The Guardian has a photo gallery about the the two postmen of Mafate:
The Cirque de Mafate, one of three calderas on the French island of Réunion in the Indian Ocean, along with Cilaos and Salazie, is a valley more than 1,000 metres deep surrounded by huge cliffs and steep peaks
René-Claude can walk 12 miles (20km) a day with up to 15kg of letters on his back. His route, a loop of 60 miles, lasts between 3 and 4 days. On 4 January 2021, René-Claude walked 35,157 steps and climbed the equivalent of 350 floors.