It has blue color stripe.
A mooring buoy is a thing which floats on the surface of the water and is anchored to the bottom to which you can tie up your boat. They are used for securing boats without an anchor. A permanent mooring system when properly designed should securely position a boat so that it can be left unattended, with little attention for a long periods of time.
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Buildings running water language weapons
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it could possibly be 1. so that's my answer