mkareshwar Jyotirlinga a shiv temple on Omkar mountain an island in mid Narmada, revered Hindu temple is the center of extreme faith. There are 12 jyotirlinga temples in world and omkareshwar is one fo them.
Another temple named as Mamleshwar on thr south bank of narmada is also of very importance as stated in the dwadash jyotirling strotra "omkar mamleshwaram" sounds as if the jyotirlinga in Omkareshwar is Mamleshwar temple. the ancient name of Mamleshwar is "Amareshwar".
Most of the visitors consider both the temples as equally sacred jyotirlinga and visit them. (as these temples are not far away.).
On completion of pilgrimage all the Hindus come to Omkareshwar and offer the holy water to Omkareshwar only then there visit to other pilgrimage is considered to be complete