Chinese exploration

Chinese exploration includes exploratory Chinese travels abroad, on land and by sea, from the travels of Han dynasty diplomat Zhang Qian into Central Asia during the 2nd century BC until the Ming dynasty treasure voyages of the 15th century that crossed the Indian Ocean and reached as far as East Africa. The Western Han envoy Zhang Qian traveled beyond the Tarim Basin in the 2nd century BC, introducing the Chinese to the kingdoms of Central Asia, Hellenized Persia, India, and the Middle East in search of allies against the Xiongnu. From 104 to 102 BC, Emperor Wu of Han waged war against the "Yuezhi" who controlled "Dayuan", a Hellenized kingdom of Fergana established by Macedonian king Alexander the Great in 329 BC. Emperor Wu also expanded Han territories beyond the Gansu corridor into the Western Regions, in what is now Xinjiang. Han military control of the region was established with the Protectorate of the Western Regions, but the Tarim Basin states were only loosely under Han control as tributary vassals on the western frontier. Gan Ying, the emissary of General Ban Chao, perhaps traveled as far as Roman Syria in the late 1st century AD. After these initial discoveries, the focus of Chinese exploration shifted to the maritime sphere, although the Silk Road leading all the way to Europe continued to be China's most lucrative source of trade. The pilgrimage of the Buddhist monk Xuanzang from Chang'an to Nalanda in India not only greatly increased the knowledge of Buddhism in China returning more than 650 texts including the Heart and the Perfection of Wisdom Sutras and inspired the immensely influential novel Journey to the West, but it also led to Xuanzang's publication of the Great Tang Records on the Western Regions, a text which introduced China to Indian cities such as the port of Calicut and recorded many details of 7th-century Bengal for posterity. Before the advent of the Chinese-invented mariner's compass in the 11th century, the seasonal monsoon winds controlled navigation, blowing north from the equatorial zone in the summer and south in the winter.