Wikipedia
IJgeul
The IJgeul or IJ trench is a man-made excavation on the bottom of the North Sea, off the coast of IJmuiden, which provides access to large vessels with deep drafts to the port of IJmuiden, and also via the North Sea Canal, to the port of Amsterdam (just like the Eurogeul for the port of Rotterdam).
The name comes from IJ and geul, a Dutch word meaning "the portion of a channel that often has to be dredged."
Mooring zone
3. 43 km of sea lane until IJmuiden
4. IJgeul
5. 23 km of sea lane until IJmuiden
6. Turn around zone
7. 0 Point
8. IJmuiden locks
9. North Sea Canal
10. The port of Amsterdam
11. The IJ
12. Amsterdam
13. IJmeer
Dotted white line the leading light.