The road passes a shimmering green mountain pasture, then dips steeply to a new US-built bridge. Across the languid Panj river is Afghanistan and the dusty northern town of Kunduz. On this side is Tajikistan, Afghanistan's impoverished Central Asian neighbour.
It is here, at what used to be the far boundary of the Soviet empire, that the US and Nato are planning a new operation. Soon, Nato trucks loaded with non-military supplies will start rolling into Afghanistan along this northern route, avoiding Pakistan's perilous tribal areas and the ambush-prone Khyber Pass.