True tidal flats are those mostly sandy areas that are void of water at low tide but then fill with the incoming tide. At high tide there may be only 4 feet of water a half mile out from shore.
The more gradual the bottom drops off, the longer the flats extend toward a depth where ocean water is found even at low tide. Tidal flats can be found up and down the eastern seaboard, and I tend to focus on the ones in my home state of Massachusetts.
Cape Cod Bay has scores of tidal flats, from small ones without a name to the large expanses such as the Brewster Flats and Chapin Flats. I’ve had good luck fishing flats on the Merrimack River and some no-name flats in Buzzards...