The Kishenganga Neelum River , the largest tributary of the Jhelum , joins it near Muzaffarabad , as does the next largest , the Kunhar River of the Kaghan valley . The Kishenganga ( Neelum ) River , the largest tributary of the Jhelum , joins it , at Domel Muzaffarabad , as does the next largest , the Kunhar River of the Kaghan valley .