Reef
The stone that looks like a turkey boiling underwater is just a reef.
It may seem like there are a bunch of turkeys under there, but it's just the shape the reef takes. Though I guess if you're looking from above the water it really does look like a bunch of turkeys freaking out.
しょう
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The reef is the Shougun's (しょう) favorite place to be nowadays. He sits next to the water, and stares down into it for hours.
You don't know if the Shougun likes the reef because he likes the beauty of the ocean, or if he's fantasizing about turkeys boiling. He's a... complex man.