The Commamur canal runs between Vijayawada Seethanagaram lock and Peddaganjam lock for a total length of 113 kilometers It takes off from the Krishna River section in river Krishna in Vijayawada on the right side upstream off Prakasam barrage through a head sluice at Seethanagaram and joins the Buckingham canal at Peddaganjam Lock near Ongole.