I believe it is the Delaware River. I seem to remember the term "Delaware mud."
I saw a post which claimed the baseball mud comes from Baltimore, as the dirt there is 'extra fine'. Although many years ago, as a resident of the Philadelphia area I was told the apparently widely accepted story of how the mud comes from only one secret place in New Jersey, there may be some truth to the Baltimore story as I vividly recall the infield dirt at a funky softball field where we played bar league games, was the finest I had ever seen. The outfield was trash, but that infield was the best. I saw it, and it was major league quality, if not even better.
check out http://baseballrubbingmud.com/main.htm for some more answers about baseball mud. I heard the Mississippi River. Mississippi mud.
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