Nara Canal, important water channel in Sindh province, Pakistan, the longest canal in the country. From its source above Rohri, it runs southward and discharges into the Puran River, an old channel of the Indus River, which flows to the sea farther south through the Rann of Kutch. Because of the uncertain water supply received through the Nara, it was connected in 1858–59 with the Indus at Rohri by a supply channel 12 miles (19 km) long. The Nara Canal irrigates more than 1,500,000 acres (600,000 hectares). With its chief canal, the Jamrao, it has a length of 513 miles (825 km) and provides a perennial water supply to numerous branch canals.