In beaches, why does the water get deeper and then shallow again before getting deep?

In several beaches I've been to in Florida and Europe the water initially gets deeper, then out a certain distance it get shallow and I can stand on the floor again properly before diving deep into the distance. Is there an explanation for this?
Answers

joanie t

the sand shifts. If you're standing up, you're on a sand bar.

Nicholas

Flat earth lol, I dunno

Anonymous

its because the Earth is flat

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A.J.

I don't have the science, but tides erode the beach sand pulling it in and there is a flow of water that parallels the coast that might erode an underwater channel.

Gladys

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Ogden

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I Hate Commerce

someone may know.