The Tungabhadra and the Koyna are tributaries of the Krishna River.

Krishna River:
The Krishna River is one of the major rivers in India. It is the fourth-longest river in the country, flowing through the states of Maharashtra, Karnataka, Telangana, and Andhra Pradesh. The river originates from the Mahabaleshwar hills in Maharashtra and empties into the Bay of Bengal in Andhra Pradesh.

Tungabhadra River:
The Tungabhadra River is a major tributary of the Krishna River. It is formed by the confluence of the Tunga and Bhadra rivers in the state of Karnataka. The Tungabhadra River flows through the districts of Shivamogga, Chikkamagaluru, Davanagere, Haveri, Bellary, and Koppal before joining the Krishna River in Andhra Pradesh. The Tungabhadra Dam, located near Hospet in Karnataka, is a significant dam on this river.

Koyna River:
The Koyna River is also a tributary of the Krishna River. It originates in Mahabaleshwar, Maharashtra, and flows through the districts of Satara and Sangli before joining the Krishna River. The Koyna Dam, located in Satara district, is a major hydroelectric project on this river.

Importance of the Krishna River:
The Krishna River is of immense importance to the states it flows through. It provides water for irrigation, drinking water supply, and hydropower generation. The river is also used for navigation and is a lifeline for agriculture in the region. The Krishna River basin is known for its fertile soil and supports a significant agricultural economy.

Conclusion:
In conclusion, the Tungabhadra and the Koyna are important tributaries of the Krishna River. These rivers contribute to the overall flow and water resources of the Krishna River, playing a crucial role in the socio-economic development of the regions they pass through.