Your trip starts on the East Coast of the U.S. Here, the Atlantic Ocean washes up on the shores of the coastal plain.
That’s the area of low land by the edge of an ocean. This land is at sea level, which is the same height as the ocean's surface. Going west, the land rises in the Piedmont. That's the name for the hills east of the Appalachian Mountains. Between the sea and these peaks lie all sorts of landscapes. Feel the ocean breeze on your face as you take the first step.