Another pool

Another part of town, and we have found another pool. This one was new to us.

[Allison Williams]

I wonder if these are like sinkholes that open up unexpectedly in certain parts of the United States.

[Speedwell]

@allie912 I don't think that this pool is a sink hole. I don't know of any close to me, because we are on clay. However I have heard of sink holes occuring in other parts of the UK, where the bedrock is a limestone. The notice of "deep Water" would be a warning for parents with children, because there is housing all around, and very close to this water feature.