Taiwan is strategically situated within East Asia, but little is known of it until the sixteenth century. The Chinese spread far and wide throughout Asia even before the Christian era, but allowed this large and fertile island lying so close to the Mainland to remain in relative obscurity until the middle of the Ming dynasty (1368–1644). The cause of this isolation is that Taiwan had no large quantities of marketable products to attract traders and that the island still lay outside the network of Asian trade routes of the time.