More especially is this the case in the neighborhood of the city of Kabul, which is perhaps the Caspatyrus of Herodotus, where Darius built the fleet which descended the Indus. South of Aria and Gandaria, in the tract between the Great Desert and the Indus valley, the plateau was occupied by four nations the Thamanseans, the Sarangians, the Sattagydians, and the Arachotians.

But the obstacles to such a voyage are numerous; first, whether Pactzia be Peukeli, and Caspatyrus, Multan: secondly, if Darius were master of Multan, whether he could send a ship or a fleet down the sea, through tribes, where Alexander fought his way at every step: thirdly, whether Scylax had any knowledge of the Indian Ocean, the coast, or the monsoon: fourthly, if the coast of Gadrosia were friendly, which is doubtful, whether he could proceed along the coast of Arabia, which must be hostile from port to port: these and a variety of other difficulties which Nearchus experienced, from famine, from want of water, from the construction of his ships, and from the manners of the natives, must induce an incredulity in regard to the Persian account, whatever respect we may have to the fidelity of Herodotus."