The migrant smuggling business is booming along four main corridors. In the Middle East, war and violence continue to drive people out, to Europe and beyond. In the Southern Sahara, poverty-stricken West Africans are heading north, often to Libya, hoping to survive boat journeys across the Mediterranean to Europe. In the Americas, impoverished migrants from Central America head to Mexico, intending to slip over the US border. In Southeast Asia, workers living in poverty are smuggled into richer, neighbouring countries, as asylum seekers and refugees from elsewhere arrive and find themselves stranded.