Final answer:
Charleston is the capital of West Virginia, located at the confluence of the Elk and Kanawha rivers, and holds the unique position as the least populated state capital while being the state's most populous city.
Step-by-step explanation:
The capital of West Virginia is Charleston. Situated at the confluence of the Elk and Kanawha rivers, Charleston is notable for being the least populated state capital that also happens to be the most populous city within the state. Despite its status as the state capital, it has a relatively small population in comparison to the capitals of other states.