[1] The source of the Liwiec is located to the north-west of Międzyrzec Podlaski near Siedlce and crosses Wyszków, Liw, Węgrów, and Stara Wieś.

Its lower estuary and confluence with the Bug River is located near the towns of Wyszków and Kamieńczyk.

It has a Natura 2000 EU Special Protection Area region.

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