hi Ghost, thanks for your note - had to look up a few words ;)
So, today I learned that there is a structure called Breakwater ... it was just a name I made up :)
and I've learned that oblique means an angle not 90 percent (did know the word in its font use though)
Concerning my Breakwater ... it is at the ocean, but I haven't gotten around to map the harbour/docks/breakwaters yet, still busy with the land structures :) - I'm planning to make some docks for fishing boats in the river close to the sea as the original harbour, then as the city grew they added a new harbour on the ocean side. When I get that far, feel free to correct me in my attempts to map those elements ;)

