Exactly! I live on a so-called wetland which was NOT disclosed to me prior to sale. Had I known in advance I would have NEVER purchased this property in a million years. BTW Realtors or the sellers seem to be under NO obligation to disclose that it’s on a so-called wetland. It’s buyer beware. This is NYS and you literally have to go down to the DEC to find out. They don’t have these records in the town/county clerks or tax maps office either.
Indeed, there are valuable marshland estuaries along the coasts and low lying lake areas. But, the majority are depressions in flat lands that naturally puddle during rain events or drainage ditches that have not been maintained by government agencies and subsequently run onto someone's private property. These are used as tools to legally inure or extort private citizens.
To understand the value of these smaller wetlands, just watch what happens to one of them when they are in the path of a municipal expansion, roadway or government development.
You can access both the NYS and Federal wetland maps on the web and the Towns also have them.