渭水渭源鳥鼠山,東流八百一十八公里。受而入於

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渭水

渭出於鳥鼠山,《山海經》云鳥鼠同穴之山也,在甘肅渭源西南。東流越溝壑,過天水而穿三秦。歷世開渠導渭,水網縱橫,以給稼穡,膏腴關中,號稱天府。六代皆利渭而興。

越秦川,過華陰,抵潼關之北,乃入於河。

支流之大也,涇、洛也。古人觀涇水入渭處,清濁分明,乃有「涇渭分明」之語。

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