Sentence:  Acesines, two of the rivers which fall into the Indus, he observed that there were many crocodiles in those rivers, and that the country produced beans of the same species with those which were common in Egypt. From these circumstances, he concluded that he had discovered the source of the Nile, and prepared a fleet to sail down the <WSD>Hydaspes</WSD> to Egypt. 
Meaning of the word marked with <WSD> tags:  The river Jhelum, on the Indian subcontinent, especially as the location of a battle fought by Alexander the Great against King Porus in 326 BCE.