Buh or Southern Buh (bōkh) [key], Ukr. Pivdynnyy Buh, river, c.490 mi (790 km) long, rising in the Volhynian-Podolian hills, W Ukraine. The Buh, flowing generally SE into the Black Sea, is navigable for c.100 mi (160 km) from Voznesensk to its mouth. It is also called the Bug or Southern Bug.
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