Afghanistan: 'The heroin trail. Flying over the river valleys of Helmand, southern Afghanistan, the lush green crops leap out of the monotonous beige desert landscape, spreading out as far as the eye can see. In the well-tended plots the farmers harvest their crop, but much of it is neither wheat nor vegetables - it's a cash crop and it's worth a huge amount of money.
Field after field is full of opium poppies and the gum the labourers are extracting is the raw material for heroin.' (BBC)