Chhachh (Punjabi and Urdu: چھچھ ‎) is a region consisting of an alluvial plain extending from Attock District of Punjab, Pakistan, south-west 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, and it was the most fertile area of Rawalpindi Division.