- **Hirakud Dam** is a significant structure located in the state of Odisha, India.
- It is built across the **Mahanadi River**. ✅
- The **Mahanadi River** is one of the major rivers in central-east India, flowing through Chhattisgarh and Odisha before emptying into the Bay of Bengal.
- **Option 1: Betwa** is incorrect. The Betwa River is a tributary of the Yamuna and flows through Madhya Pradesh and Uttar Pradesh.
- **Option 3: Krishna** is incorrect. The Krishna River runs through the states of Maharashtra, Karnataka, Telangana, and Andhra Pradesh.
- **Option 4: Godavari** is incorrect. The Godavari River is India's second-longest river, flowing through Maharashtra, Telangana, Andhra Pradesh, and several other states.

YOUR ANSWER IS RIGHT