At which river did Alexander the Great achieve his final battle against a powerful Indian army?

Alexander the Great achieved his final battle against a powerful Indian army at the Hydaspes River in 326 BCE. This battle was significant and marked a turning point in Alexander’s campaign as it demonstrated his military prowess against King Porus, who commanded a large army that included war elephants. The engagement at the Hydaspes was notable for its strategic challenges, as it involved crossing a river to confront a well-prepared opponent.

The victory at the Hydaspes allowed Alexander to gain control over northern India and further expanded his empire, emphasizing his reputation as one of history’s greatest military leaders.

The other river options do not align with the historical context of this specific battle. The Indus River and Ganges River are notable for various reasons in Indian history, but they are not associated with Alexander's final confrontation in India. The Nile River is located in Egypt and has no connection to Alexander's campaigns in the Indian subcontinent. Thus, Hydaspes is definitively the correct choice for this question.