India

The contested borders of South Asia, where two nuclear-armed states and their neighbours dispute territory, water and responsibility for cross-border violence. Five fault lines run through it: the air campaign and border clashes between Pakistan and Afghanistan along the Durand Line; the Kashmir territorial dispute between India and Pakistan; the separatist insurgency in Balochistan; the Indus Waters Treaty, suspended by India and contested by Pakistan; and the militant attacks that each state attributes to the other. Pakistan is a party to four of the five.