Strabo 15.1.25; Loeb, trans. Jones
The following, too, is one of the things agreed upon by all who maintain the resemblance of India to Aegypt and Aethiopia: that all plains which are not inundated are unproductive for want of water. Nearchus says that the question formerly raised in reference to the Nile as to the source of its floodings is answered by the Indian rivers, because it is the result of the summer rains; but that when Alexander saw crocodiles in the Hydaspes and Aegyptian beans in the Acesines, he thought he had found the sources of the Nile and thought of preparing a fleet for an expedition to Aegypt, thinking that he would sail as far as there by this river, but he learned a little later that he could not accomplish what he had hoped; "for between are great rivers and dreadful streams, Oceanus first,"30 into which all the Indian rivers empty; and then intervene Ariana, and the Persian and the Arabian Gulfs and Arabia itself and the Troglodyte country.
Such, then, are the accounts we have of the winds and the rains, and of the flooding of the rivers, and of the inundation of the plains.