Major Physical Features of the United States SS4G1 Locate important physical and man-made features in the United States. Locate major physical features of the United States and mark them on the attached map: 1. the Atlantic Coastal Plain 2. the Great Plains 3. the Continental Divide 4. the Gulf of Mexico 5. the Mississippi River 6. the Great Lakes b. Locate major man-made features of the United States and mark them on the attached map: 1. New York City, NY 2. Boston, MA 3. Philadelphia, PA 4. Washington, D.C. 5. Gettysburg, PA 6. the Erie Canal