Europe's River Polygon Shapefile Data

I am a Data ​Scientist ​specialised ​in GIS at ​MarineTraffic ​so access to ​data about ​Europe's ​river traffic ​is crucial to ​my work.  ​

Is there a ​public dataset ​that has the ​polygons of ​European rivers ​that have ​transportation ​activity (like ​ships)? ​

I am looking ​for very ​detailed data ​resolution (1:​50.000). If you know any institute collecting these data sets, please let me know.