[2] According to Zbigniew Gołąb, the Slavic hydronym Bug as *bugъ/*buga derives from the Proto-Indo-European verbal root *bheug- (with cognates in old Proto-Germanic *bheugh- etc.

[6] On the Bug, a few kilometers from the Vysokaye in Kamenets District of the Brest Region, is the westernmost point of Belarus.

[2] The basin experiences annual high-water levels during spring flooding due to thawing snow, after which a low flow period starts and lasts until October or mid-November.

Occasional summer floods often occur in the headlands, where mountains influence favorable flash-flood conditions.

During the winter the river can have temporary ice-outs that sometimes provoke ice jams, causing an increase of the level up to 2 metres (6.6 ft).