Nirmaljhara Island is one of the popular islands in the brackish water Lagoon. The island is renowned for shrine of Lord Vishnu and a water stream, known as Nirmaljhara. This stream flows out from an image of Lord Vishnu established at the site. Associated with mythological legends, the stream is visited by natives and tourist alike for paying homage. Over the years, the beautiful island has evolved as one of the chief picnic spots.