Chandanam Swayambhu Oval Shivling of Lord Mahadev Original Natural And Rare Narmadeshwar Shivling with Yonibase | Natural Narmada Stone Shivling: . The Narmadeshwar Shivling, also known as Narmada Shivling or Banalinga, is a sacred, naturally formed stone Shivling found in the holy Narmada River. These Shivlings are believed to be Swayambhu, meaning self manifested, shaped naturally by the continuous flow of the river over thousands of years. In Hindu tradition, worshipping a Narmadeshwar Shivling is considered highly auspicious and equivalent to worshipping Lord Shiva in his purest form.