Valley
A valley has a "head" where it begins in the mountains or hills, "sides" where it rises up on either side, a "floor" which is where the valley is most flat. Some valleys have an "entrance" where the valley opening can be seen between two hills or mountains or cliffs. A place where a valley is very narrow and has high walls is sometimes called a "gorge". (This word "gorge" is sometimes used to mean the "throat" on a human body).