Answer: Rohtas
Notes: In Bihar, Rohtas district has the highest share in area under canal irrigation with 3.19 lakh hectares. It is followed by West Champaran and Aurangabad which account for 1.82 lakh hectares and 1.64 lakh hectares respectively. These three districts together account for nearly 38.3 percent of the total canal irrigation in the state. Canal irrigation supports the area's predominantly agrarian economy, offering year-round water supply for crops.
