Step 1: Locating the river and associated heritage sites.
The Tungabhadra river flows through Karnataka and is historically associated with the Vijayanagara Empire.
Step 2: Identifying the UNESCO site.
Hampi, the former capital of the Vijayanagara Empire, is situated on the banks of the Tungabhadra river and is a UNESCO World Heritage Site, recognized for its Dravidian architecture and temple ruins.