Note 301 — BOOK VI. AN ACCOUNT OF COUNTRIES, NATIONS, SEAS, TOWNS, HAVENS, MOUNTAINS, RIVERS, DISTANCES, AND PEOPLES WHO NOW EXIST, OR FORMERLY EXISTED.
John Bostock translation
The people of Serica, which country with Ptolemy corresponds to the north-western part of China, and the adjacent portions of Thibet and Chinese Tartary. The capital, Sera, is by most supposed to be Singan, on the Hoang-ho, but by some Peking. Pliny evidently refers to the same people, and has some notion of the locality of their country.