Arrian,
The Anabasis of Alexander
“ The pilot Onesicritus thought they ought to have gone thither; but Nearchus says that he himself prevented it, so that after sailing right round the Persian Gulf he might be able to give a report to Alexander that he had accomplished the voyage on which he had sent him. For Nearchus said he had not been despatched to navigate the Great Sea, but to explore the land bordering on the sea, to find out what men inhabit it, to discover the harbours and rivers in it, to ascertain the customs of the people, and to see if any of the country was fertile and if any was sterile. ”
