Wondering if someone knows what is this green thing in the sea? Bulgaria Sozopol, I took the photos myself while in a restaurant in front of the sea. I do not know what are they I asked an acquaintance and they suggested that could be something that directs the ships , but asking here to verify if it is true

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  • Being pedantic, are you sure it's Sozopol? In looking at the image and google, the only place that seems to have a sea wall to right and and an outcrop to the left is the beach at Chernomorets.
    – Peter M
    Commented Aug 3, 2020 at 20:04

2 Answers 2


It is, as far as I can see it in the picture, indeed something to help shipping traffic. A buoy.

It looks pretty much like one in this Wikipedia link.

There are many variations, most in red and green but other colours are used at times.

  • It looks wrong though. A green buoy, which denotes the starboard side of a channel, ought to be pointy, not cylindrical. Commented Aug 4, 2020 at 7:17
  • @KristvanBesien there are some wires formed into a point. Perhaps it was taken from somewhere in Region B and modified superficially.
    – phoog
    Commented Aug 4, 2020 at 22:05
  • @KristvanBesien it's a very normal shape for a buoy demarcating a shipping lane. A cylindrical body with a wire framework and a light.
    – jwenting
    Commented May 17 at 12:19
  • @jwenting The point is, it's a square silhouette, and being in Europe it should be colored red. That's what "looks wrong". The pictured buoy would only be seen in the Americas or a few Pacific island locations, not in Europe. See en.wikipedia.org/wiki/Lateral_mark
    – nobody
    Commented May 18 at 2:18
  • @nobody colour depends on the side of the shipping channel it demarcates.
    – jwenting
    Commented May 19 at 16:34

This is a lateral buoy delimiting a channel for navigation.

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