While most of the Northeastern United States lie in the Appalachian Highlands physiographic region, some are also part of the Atlantic coastal plain which extends south to the southern tip of Florida. The coastal plain areas (including Cape Cod in Massachusetts, Long Island in New York, most of New Jersey, Delaware, and the Chesapeake Bay in Maryland and Virginia) are generally low and flat, with sandy soil and marshy land. The highlands, including the Piedmont and the Appalachian Mountains, are generally heavily forested, ranging from rolling hills to summits greater than , and pocked with many lakes. The highest peak in the Northeast is Mount Washington (New Hampshire), at .