Goddess Sunanda is an incarnation of Goddess Shakti. She is believed to have appeared from the body part of Sati that fell on earth after the famous episode of Shiva carrying the body of Sati around the universe and Vishnu cutting it with his Sudharshana Chakra to save the world from annihilation.
Goddess Sunanda appeared where the nose of Goddess Sati fell on earth.
The Shaktipeetah associated with Goddess Sunanda is located in Bangladesh.
Lord Shiva resides in the form of Triambak with Goddess Sunanda.