BMAC materials have been found in the Indus Valley Civilisation, on the Iranian Plateau, and in the Persian Gulf. Finds within BMAC sites provide further evidence of trade and cultural contacts. They include an Elamite-type cylinder seal and a Harappan seal stamped with an elephant and Indus script found at Gonur-depe. The relationship between Altyn-Depe and the Indus Valley seems to have been particularly strong. Among the finds there were two Harappan seals and ivory objects. The Harappan settlement of Shortugai in Northern Afghanistan on the banks of the Amu Darya probably served as a trading station.