a major trading center and the third largest city. Other important cities and towns are: Kakinada , Warangal , Guntur , Rajahmundry , Tirupati , Srikakulam , Machilipatnam , Tenali , Ongole , Kurnool , Anantapur , Karimnagar , Nizamabad , Nirmal , Nellore , Bhimavaram , Narsapuram and Eluru .