The network of Polish waterways, comprising navigable canals and canalised or free-flowing rivers, as well as a number of interconnected lakes, is nearly 3650km long. Waterways of international importance (classes IV and Va) represent only 1.9 and 3.0% of this length respectively. Most waterways (59%) are Class I, for a carrying capacity limited to 180 tonnes at a loading depth of 1.4m. In view of these restrictions, waterborne traffic accounts for less than 1% of all inland freight movements in Poland. The main commercial waterways are the Oder, the Vistula and the Vistula-Oder waterway. The rivers Bug and Wieprc are no longer navigated to any significant extent. The most important waterways for tourism are the Augustów and Warmia (or Elblanski) Canals. The Slesinski Canal is also potentially of great interest, joining the Warta at its upstream limit of navigation to the Bydgoszcz Canal…

Information about the network : http://www.en.mi.gov.pl