Shyamsunder Nabaratna Mandir' also known as ‘Sonabaria Math’ is located at Sonabaria, Kalaroa, Satkhira. It is a Hindu temple built by Hariram Das (Durgapriya Das) in 1767 AD. Navaratna (nine gems) temple is a typology of Hindu temples. Navaratna (nine gems) temple is a typology of Hindu temples. This type of temple consists of three distinct levels and a unique architectural pattern. Shyamsundar Temple is one of the surviving navaratna temples of the country, and is famous for its brilliant architectural style and terracotta decorations.