There is a Victorian style building in the background, and in the foreground is a lake where a tiny paddle boat sits with three people in it.
The pond is too shallow for any boating.
If the pond is too shallow for any boating, then there cannot be people boating on it.
There may be either pond or lake.
Three people cannot sit in a paddle boat if the water is not deep enough. A pond refers to a small body of water, and a lake is much larger.