Chhachh or Chach (Hindko and Urdu: چھچھ ) is a region located between Peshawar and Islamabad at the northern tip of Attock, consisting of an alluvial plain extending from Attock District of Punjab, Pakistan, southwest of Topi and Swabi. It is bounded on the north and west by the Indus river and is about 19 miles (31 km) long (from east to west) and 9 miles (14 km) broad. Percolation from the Indus makes the area extremely fertile. The population of the area is primarily Hindko and Pashto speakers.