The area of Antwerp includes the entire harbor and several empty areas. Looking at the map, it seems to include islands of high density surrounded by empty area

The area of Antwerp includes the entire harbor and several empty areas. Looking at the map, it seems to include islands of high density surrounded by empty areas. That works very, very well for public transportation. The issue with transit and density is not about distances, is actually about the number of people living and working within walking distance of a transit stop. If you increase density by 5X, that number increases by 5X. So two cities with the same density, one spread out evenly and the other in high-density islands surrounded by low density seas, have very different viabilities for public transit.