Chhachh or Chach is an alluvial plain located in the northern Punjab, Pakistan. Triangular in shape, Chhachh is bounded by the left bank of Indus to the northwest, Gandghar range to the east and the highlands along the Grand Trunk Road to the south, covering an area of some 200 mi2 (520 km2). Administratively a part of Hazro Tehsil of Attock District, Chhachh is reputed to be the most fertile in Punjab.