The
Bug or
Buh River, (
Polish Bug 
[buk];
Ukrainian ???????? ???, Zakhidnyy Buh;
Belarusian ????´??? ???, Zakhodni Buh;
Russian ???????? ???, Zapadnyy Bug) called sometimes Western Bug (like in Ukrainian, Belarusian and Russian always) to distinguish it from
Southern Bug, flows from central
Ukraine to the west, forming part of the boundary between Ukraine and
Poland, passes along the
Polish-
Belarusian border, within
Poland, and empties into the
Narew river near
Serock (actually to the artificial
Zegrze Lake). The part between the lake and the
Vistula River is sometimes referred to as
Bugo-Narew. The Vistula River drains into the
Baltic Sea.
The Bug is 772 km long (587 km in Poland) and is the 4th longest Polish river. The basin area is 39,420 km² (19,284 km² in Poland). It is connected with the Dnieper river by the Dnieper-Bug Canal.
Traditionally the Bug was also often considered the ethnographical border between Orthodox and Catholic peoples. The Bug was the dividing line between German and Russian forces following the invasion of Poland in the Second World War.
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