One of the two rivers called Bug (pronounced Boog), the Western Bug, or Buh (Belarusian: Захо́дні Буг; Russian: За́падный Буг; Ukrainian: Західний Буг, Zakhidnyi Buh), flows from central Ukraine to the west, forming part of the boundary between that nation 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 usually referred to as Bugo-Narew.
Bug is 772 km long (587 km in Poland) and is the 4th longest Polish river. The basin area is 39,420 km (19,284 km in Poland).
Bug is the name of two rivers in Europe, alternatively spelt Boog.
The better known of the two, also known as the Western Bug, flows from the central Ukraine to the west, forming part of the boundary between that nation and Poland.
The other BugRiver, this one sometimes known as the Southern Bug, is entirely located in Ukraine.