Further along its course , the Lauwers splits into two branches , the Frisian Oude Lauwers and the Zijldiep , in Groningen province .
The Lauwers achieves the width of a true river at the point where it gains its tributary , the Oude Vaart , near the Schalkendam .
Further along its course , the Lauwers splits into two branches , the Lauwers     and the Zijldiep , in Groningen province .
The Lauwers achieves the width of a true river at the point where it gains its tributary , the Oude Vaart , near the Schalkendam .