"I went down to Basra with a group of merchants and companions, and we set sail in a ship upon the sea, and at first I was seasick because of the waves and the motion of the vessel, but soon I came to myself and we went about among the islands, buying and selling.”
—The Tale of Sindbad the Sailor, from The 1001 Nights
Besides sailing across the Indian Ocean, there was another sea route from Arabia to India, the oldest of them all. It was not dependent on the monsoon and could be sailed without knowledge of the stars. The Arabian Gulf was the natural corridor between Mesopotamia and India, and the voyage could be made in small boats simply by hugging the coast, always keeping land in sight. Maritime contacts between Mesopotamia and India through Gulf waters go back to the very beginnings of urban civilization in the third millennium BC, when Sumer on the Tigris and Euphrates Rivers was in touch with Harappa on the Indus.
Unlike the Red Sea, whose reef-filled waters and complex wind regime required skilled pilotage, the Arabian Gulf was relatively easy to navigate. While the shores of the Red Sea were sparsely inhabited and almost waterless, the headwaters and eastern shore of the Gulf were home to ancient civilizations. Along its coasts have been found the scattered evidence of some five millennia of trade: fragments of pre-Sumerian al-‘Ubaid pottery from the third millennium BC, Chinese celadon and early Islamic glazed jars, Indian bangles, Gujarati carnelian beads, 19th-century coffee cups, Roman coins and the occasional Chinese cash.
via Saudi Aramco World : The Seas of Sindbad.