Serica (, Ancient Greek: Σηρικὰ) was one of the easternmost countries of Asia known to the Ancient Greek and Roman geographers. It is generally taken as referring to North China during its Zhou, Qin, and Han dynasties, as it was reached via the overland Silk Road in contrast to the Sinae, who were reached via the maritime routes. A similar distinction was later observed during the Middle Ages between "Cathay" (north) and "Mangi" or "China" (south). The people of Serica were the Seres (Ancient Greek: Σῆρες), whose name was also used for their region. Access to Serica was eased following the Han conquest of the Tarim Basin (modern Xinjiang) but largely blocked when the Parthian Empire fell to the Sassanids. Yule summarized the classical geographers:
If we fuse into one the ancient notices of the Seres and their country, omitting anomalous statements and manifest fables, the result will be something like the following:—"The region of the Seres is a vast and populous country, touching on the east the Ocean and the limits of the habitable world, and extending west to Imaus and the confines of Bactria. The people are civilized, mild, just, and frugal, eschewing collisions with their neighbours, and even shy of close intercourse, but not averse to dispose of their own products, of which raw silk is the staple, but which include also silk-stuffs, fine furs, and iron of remarkable quality." That is manifestly a definition of the Chinese.
Some scholars, however, contend the Seres were not the Chinese themselves but tribes speaking Indo-European languages on the western edges of the Chinese dynasties and empires who traded with the ancient Indians, such as the Yuezhi, Saka, and Tocharians.
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