I've come across them in two places.
The English Channel, near the narrow point between the UK and mainland Europe. If I remember correctly, they were near the center.
The second place was up near Scapa Flow. Not in the harbor but in the channel area to the south. In fact this is the first time I had ever seen them. I had to submerge because of escorts/destroyers and while sailing underwater I was actually looking for possible "sub nets". In the periscope off in the distance there was something that looked like a black spec. Once I got closer it was clearly a mine attached to a chain that went down to the seabed. They were setup in a row, so it that was easier to deal with than if they had been randomly placed around.
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