Liwiec
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Liwiec is a river in Poland, in the plains of Southern Podlachia and central Masovia. It is 126 kilometres long and drains 2779 square kilometres. Its source is located to the north-west of Międzyrzec Podlaski near Siedlce and crosses Wyszków, Liw, Węgrów and Stara Wieś. It finds its estuary into Bug near the towns of Wyszków and Kamieńczyk.