The closure of trails across the Sahara between the Sudan and Libya in 2003 has led to the dismantling of one of the main routes taken by Sub-Saharan migrants who made journeys to North Africa during the 1990s. However, this trans-Saharan trail was initially a migratory field restricted to Darfour. How has it extended subsequently to the whole of the Sudan ? What reconfigurations did the decision to close it generate in all the towns and markets integrated in the migration and trade networks ? This article deals with the simultaneous effects on the permanence and the transformation of the trading communities, migratory flows, markets and points of passage of trans-Saharan flows at the departure point or via the Sudan.