small frontier state, central North-West Frontier Province, Pakistan. It became part of Pakistan in 1947. Amb has an area of 27 square miles (70 square km) and lies on the west bank of the Indus River, 15 miles (24 km) north of the Tarbela Dam and northwest of Abbottābād. Apart from Amb, the main township, the state now consists of only three villages. The residence of the ruler (nawab), formerly at Amb, is now at Darband. The state is mainly agricultural, with wheat, barley, and corn (maize) the chief crops.