Słudwia is a river in Central Poland. Its source is located near the village of Długołęka. The river flows for 46.1 kilometres (28.6 mi) through the Kutno Plains, before joining the Bzura near the town of Łowicz. Its drainage basin area is 649 square kilometres (251 sq mi). The river is best known for the 1928 Maurzyce Bridge built across it, the first welded road bridge in the world, designed by Stefan Bryła.