Middle Eastern seafarers had just begun to take over the Indian Ocean trade routes in the 10th century and found Maldives to be an important link in those routes as the first landfall for traders from Basra sailing to Southeast Asia. Trade involved mainly cowrie shells—widely used as a form of currency throughout Asia and parts of the East African coast—and coir fiber. The Bengal Sultanate, where cowrie shells were used as legal tender, was one of the principal trading partners of the Maldives. The Bengal–Maldives cowry shell trade was the largest shell currency trade network in history.