Karneshwar Temple is situated at Kasba village of Sangameshwar taluka in Ratnagiri, Maharashtra, India. Temple is Constructed in the 11th century, facing east and built entirely in black stone, this Shiva temple is 26 meters long and 23 meters wide and stands on a 1.5 meter high plinth.
An important feature of this temple is the pillars in its hall. The horizontal beams on the pillar and the yakshas shown to weigh the beams. Yaksha Pratima is carved on the area where the pillars and beams meet at right angles to each other. Those yakshas are carrying a load of beams on their own shoulders. But the special feature of Karneshwar temple is that some deities are carved in place of Yakshas. The idols of Ganapati, Narasimha and Saraswati are seen to be engraved. Also, another feature of this temple is the unique carvings on the roof of its Mukhmandapa. A circular dome is carved in the center of the Mukhmandapa.
Sangameshwar is located at the confluence of Alaknanda and Varuna rivers. There is an ancient book called Sangameshwara Mahatmya. It contains the story of the creation of this temple. Chalukya, an archer king, had three sons, Karna, Naga and Singhana. Among them, Karnaraja built this temple from Sthapathi who also built Mahalaxmi Temple of Kolhapur.