One of the Tweleve Jyotirlinga Omkareshwar is also know as "Omkareshwar- Mandhata' . 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"). But as per the sloka on dwadash jyotirligam, Mamleshwar is the jyotirling, which is on other side of Narmada river.
Omkareshwar temple is the main attraction of the pilgrims. In fact the town owes its very existence to this temple. As to who constructed the temple and when , is all shrouded in mystry.The sanctum sanctorum containing the Jyotirlinga seems to have been originally a small temple of the old construction style, the dome being made of layers of stone slabs and not of circular cut stones. As this temple is too close to the precipitously deep bank of the Narmada to the south, the great extension is of new construction style. This is the reason why the sanctum sanctorum and the main deity are neither in the front of the main door nor below the higher conspicuous Shikhar or the tower of later construction.
The temple stands on a one mile long, half mile wide island formed by the fork of the Narmada. The soft stone of which it was constructed has lent its pliable surface to a rare degree of detailed work, of which the frieze figures on the upper portion is the most striking. Also intricately carved is the stone roof of the temple. Encircling the shrine are verandahs with columns which are carved in circles, polygons and squares.