The answer to this question is subjective. One can say that the trees make a natural area beautiful, while others may say that the whole area is what makes it extremely beautiful. For me, however, what makes a natural area beautiful is the fact that they remain untouched or away from being developed by humans.
I find the Great Barrier Reef beautiful because the existence of such place is truly remarkable for it contains the world’s largest coral reefs which house around 1,500 species of fish. Although the government exerted effort in maintaining its beauty, a large portion of this natural area remains untouched from being developed and touched, and it fills my heart with glee to know how nature truly works.