Mud flats, also known as tidal flats, are areas of land that are covered in shallow water at high tide and exposed at low tide. They are typically found in coastal areas and are composed of mud, sand, and silt. The term 'Mud Flat' can be broken down into two words: STY (3 letters) and MARSH (5 letters). STY is an old English word meaning a small area of land, usually marshy or muddy, and MARSH is an area of low-lying land that is flooded in wet seasons or at high tides.