The Tunga River (alternatively spelled Thunga) is a river in Karnataka state, southern India. The river is born in the Western Ghats on a hill known as Varaha Parvata at a place called Gangamoola. From here, the river flows through two districts in Karnataka - Chikmagalur District and Shimoga District. It is 147 km long and merges with the Bhadra River at Koodli, a small town near Shimoga City, Karnataka. The river is given the compound name Tungabhadra from this point on. The Tungabhadra flows eastwards and merges with the Krishna River in Andhra Pradesh.