Holland - IJmuiden - North Sea Channel and sleuzes
At the left you will find the Small Sleuze and the Southern Sleuze (a ship has just left it, you can still see its track in the water), in the centre of the picture is the Middle Sleuze, and at the right is the Northern Sleuze, which is the largest. The IJmuiden sleuzes are open all around the clock to give ships access to the tidal free harbours of Beverwijk, Zaandam, and Amsterdam.
If you want to see more air photos about IJmuiden and Beverwijk click on the link below (the site with very nice info can also be read in English)
http://www.ijmuidenstrand.nl/
and then click on luchtfoto's
Built in the year le wi depth in meters below NAP level
Northern/Noordersluis 1929 400 50 -15 NAP
Middle/Middensluis 1896 200 25 -10 NAP
Southern/Zuidersluis 1876 111 18 -8 NAP
Small/Kleine sluis 1876 68 12 -5,8 NAP
Small/Kleine sluis after 2000 111 11 -3,75 NAP