*L’homme du Mékong* presents Jules Harmand’s travel writings from the Mekong region and Indochina, framed as the record of a solitary traveler moving through territories then little known to European readers. The account blends exploration narrative with close observation of river routes, landscapes, settlements, and local communities. Harmand’s training as a physician and naturalist gives the book an ethnographic and documentary quality, preserving details about travel conditions, geography, and cultural encounters. Read today, it offers a historical window into nineteenth-century exploration and the ways Indochina was represented in French travel literature. This edition, issued by Phébus in the *Le Tour du Monde* tradition, gathers a compact account of one explorer’s passage through a region defined by the Mekong River.