بولشوی اوزن (روسی: Большой Узень) رودخانهای در استان ساراتوف کشور روسیه و استان قزاقستان غربی کشور قزاقستان است. درازای آن ۶۵۰ کیلومتر (۴۰۰ مایل) و حوضهٔ زهکشی آن ۱۵۶۰۰ کیلومتر مربع (۶۰۰۰ مایل مربع) است.[1]
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/%D0%90%D0%BB%D0%B5%D0%BA%D1%81%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B2_%D0%93%D0%B0%D0%B9_%D0%9C%D0%B5%D0%BB%D1%8C%D0%BD%D0%B8%D1%86%D0%B0_%D0%BA%D1%83%D0%BF%D1%86%D0%B0_%D0%9F%D0%BE%D0%B7%D0%B4%D0%BD%D1%8F%D0%BA%D0%BE%D0%B2%D0%B0_1_%D0%B0%D0%B2%D0%B3%D1%83%D1%81%D1%82%D0%B0_2017_03.jpg/640px-%D0%90%D0%BB%D0%B5%D0%BA%D1%81%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B2_%D0%93%D0%B0%D0%B9_%D0%9C%D0%B5%D0%BB%D1%8C%D0%BD%D0%B8%D1%86%D0%B0_%D0%BA%D1%83%D0%BF%D1%86%D0%B0_%D0%9F%D0%BE%D0%B7%D0%B4%D0%BD%D1%8F%D0%BA%D0%BE%D0%B2%D0%B0_1_%D0%B0%D0%B2%D0%B3%D1%83%D1%81%D1%82%D0%B0_2017_03.jpg)
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