Khyber-Pakhtunkhwa formerly the North-West Frontier Province, or NWFP, runs for over 1,100 kilometres along the border with Afghanistan. Peshawar is the capital, and the heart of the province is the fertile Vale of Peshawar, which is watered by the Kabul and Swat rivers. This was the centre of the ancient kingdom of Gandhara and is rich in archaeological remains. It is bounded by Afghanistan to the west and north,Punjab province to the southeast, and Balochistan province to the southwest. On the western boundary of Khyber Pakhtunkhwa, along the Afghan border, are the federally administered tribal areas, a series of semi autonomous areas that are ethnically homogeneous with the province but not politically connected to it.