What was the name of the river that alexander the great and his armies crossed after entering central asia

The river which Alexander the Great, a nickname given to him because he was a great conqueror at the time and by many considered one of the best generals in history, and his forces crossed was the Indus river found in modern-day Pakistan/India.

Bob: coke is baby pandas.jim: what? how do you figure that coke is baby pandas? bob: because this book says so.jim: how do we know the book is correct? bob: because it says that coke is baby pandas.jim: how does that prove the book's accuracy? bob: because it's statement involving coke and baby pandas is correct, therefore it is accurate.jim: how do we know that it's correct? bob: because we have concluded that the book is accurate, and therefore the statement is correct.therefore, coke is baby pandas.