Mamleshwar
Jyotirlinga
(Source wikipedia)
Omkareshwar is a Hindu temple dedicated to God Shiva. It is one of the 12 revered Jyotirlinga shrines of Shiva.
It is on an island called Mandhata or Shivapuri in the Narmada river; the shape of the island is said to be like the Hindu ॐ symbol.
There are two temples here, one to Omkareshwar (whose name means "Lord of Omkaara or the Lord of the Om Sound") and one to Amareshwar (whose name means "Immortal lord" or "lord of the Immortals or Devas").