Leie
 The Leie (Dutch) or Lys (French) is a river in France and Belgium and a left tributary of the Scheldt. Its source is in Pas-de-Calais France and it flows into the river Scheldt in Ghent Belgium. Its total length is 202 kilometres (126 mi).It is a very polluted river due to the high density of population and industry in the North of France and in Belgium. Historically the Lys valley was known for the spinning and weaving of flax.