today, when the rhine river enters the netherlands from germany, most of it becomes the river waal and is no longer called the rhine. however, some of it flows north (through a canal) after which it splits into the nederrijn (lower rhine) and the ijssel. the nederrijn eventually becomes the lek, but a branch of it flows through a canal to utrecht where it is further canalised and directed west. the names for this minor waterway as it flows through the provinces of utrecht and south holland change, but all the names still include the name "rijn" and it is not unusual for it to be referred to as the "rijn". its varying names are kromme rijn ("crooked rhine"), leidse rijn ("leiden rhine") and oude rijn ("old rhine"). the oude rijn ends as it flows into a sluice at katwijk aan zee, where its waters can be discharged into the north sea. it is the area around the oude rijn that is referred to as "rijnland".