渭源 Traditional form: 渭源 Pinyin (reading): Wèiyuán Definitions: Weiyuan county in Dingxi 定西 ( Dìngxī), Gansu Characters: 渭 - a river in Shanxi province 源 - spring; source, root, head; surname Traditional characters: 渭 - a river in Shanxi province 源 - spring; source, root, head; surname