Tagant rises in the dry middle of Mauritania, a country that is mostly desert with a thin ribbon of green pressed against the Atlantic. The plateau averages around 460 meters above the sea, and across it the dunes are restless - shifting sand that piles into temporary ranges and then moves on. Days here can climb toward 38 degrees Celsius; the same nights, in the right season, drop all the way to freezing. Where groundwater surfaces, oases break the monotony with date palms and small fields. Everywhere else, the land keeps its own austere counsel. To the south lies the Aoukar basin, a great depression that once lent its name to this whole region before Tagant took over.

For most of its history, Tagant belonged to people who did not stay put. The herders moved with the water and the grazing, reading the plateau the way a sailor reads weather. That way of life depended on rain, and as the rain withdrew, the calculus changed. The droughts of the 1970s and early 1980s pushed families off the open country and into urban centers, a migration that reshaped the region within a single generation. A few sedentary cultivators farmed the better-watered south, but across most of Tagant, settling down was never the plan - it was what the drought forced. Today the region holds around 80,000 people, fewer than it counted just a few years earlier, the population still ebbing with the conditions.

Administratively, Tagant divides into three departments, each anchored by a town that has outlasted empires and droughts alike. Tidjikja, the capital, is a date-palm oasis and old caravan crossroads. Tichit, off to the east, is a medieval trading town whose stone houses have been slowly reclaimed by sand. Moudjeria sits to the southwest. The framework that organizes them is French in origin - communes grouped into a moughataa, governed by an official called a hakem - layered over a society far older than any colonial map. It is a place where the modern state is present but spread thin, its services reaching only a fraction of the scattered settlements.