I don't specialize in that particular area so I couldn't say honestly.

My primary focus when I did was just dealing with the Everglades and surroundings for the most part.

Worldwide I'm not sure I could even guess what should be more common.

Canada has those prairie potholes which are usually marshes and Canada is huge, so maybe sheer numbers it could be something like that, but by size you get things like the Everglades. I'm sure someone knows though, just not me.

Usually what happens is whoever needs to know has their own specific way of determining the thing.

As a wildlife biologist, the meme description is pretty good and would suffice for just about anything I need. The present or recent past circumstances are the most important to my work.

If I were interested in the geology, or say ground water, earth studiesor, or even the more distant past then this definition you share becomes more useful.

There are going to be even more criteria that apply for different groups, and even sometimes none of these definitions we've seen would matter because you only care if it sustains a specific species or something even less obvious.