France did not build the Office du Niger to feed Malians. The colonial administration wanted cotton - cheap, reliable cotton for the textile mills of Lyon and Rouen, grown without the risks of relying on American and Egyptian supplies. The inland Niger delta, with its seasonal floods and broad alluvial plains, looked like the answer. Bélime's plans were enormous and confident: dam the Niger at Markala, divert its water through hundreds of kilometers of canals, and turn the Sahel into an engine of empire. The scale of ambition was matched only by the scale of its failure to materialize. By 1948, after decades of effort, only about 20,000 hectares had actually been irrigated. Cotton never thrived as promised. What the scheme produced instead, in abundance, was suffering.

The fields needed workers, and the workers did not volunteer. Through the 1930s and 1940s, tens of thousands of people were rounded up across French Sudan and forced to labor on the canals and the Markala dam, much of it built between 1935 and 1947. They worked in brutal conditions, far from home, under colonial police control. Many died. Many tried to flee, but flight was not an option for everyone - some were held by force, others had no home left to return to, or were pressed by local hierarchies that the French had co-opted. These were farmers and herders with families and villages of their own, conscripted into someone else's vision of progress. By the time the project was nationalized in the early 1960s, the number of resettled farmers had grown to only about 42,000 - a fraction of Bélime's millions, and every one of them a person the original plan had counted as a unit of labor, not a life.

The engineering, at least, endures. At Markala, a dam holds the Niger five and a half meters above the riverbed, and the Canal Adducteur draws water off the left bank into a system that fans out across the plain. The scheme revived two ancient dead channels of the river - the Fala de Molodo, running north for 135 kilometers, and the Fala de Boky-Weere, bending east toward Macina - waterways that once filled only during the annual flood. Today they carry water year-round. The Niger here is a river of extremes: in September its discharge at Markala can peak around 2,800 cubic meters per second, then collapse below 120 in the dry months of February through April. The Office du Niger draws roughly a tenth of the river's total flow, and an international agreement guarantees at least 40 cubic meters per second always passes the dam for those living downstream.

The colony's cotton dream became, in independent Mali, something genuinely useful. Rice replaced cotton as the dominant crop, and the Office du Niger now grows around 320,000 tons of it a year - roughly 40 percent of all the rice produced in the country. Vast joint ventures between the Malian state and Chinese companies raise sugar cane on thousands of irrigated hectares, supplying a quarter of national sugar consumption. The land that was meant to enrich France now helps feed Mali. It is one of the great agricultural resources of the Sahel, sustained by the same canals that cost so many lives to dig.

The struggle over this land did not end with colonialism. In 2006 the United States, through the Millennium Challenge Corporation, signed a 461-million-dollar agreement to expand the Alatona zone - a project cut short in 2012 when a military coup deposed Mali's elected government. More controversial still was the 2008 deal granting Libya a 50-year lease on 100,000 hectares of farmland through a company called Malibya, on terms so opaque that the agreement only became public when a copy leaked online. Critics noted what the original scheme had ignored a century earlier: that the land was already occupied by villages, that water is finite, and that the people living on it were once again being asked to make way. The Office du Niger remains, in this sense, exactly what it has always been - a place where the dreams of the powerful are written onto the lives of those who farm the delta.