Upper Egypt was the heartland of the Kingdom at the peak of its power and influence, and the remains of its ancient cities form one of the most important and breathtaking archaeological collections in the world.
Nothing remains of Upper Egypt and we know nothing about the place.  
mnli hypothesis: Nothing remains of Upper Egypt and we know nothing about the place.   premise: Upper Egypt was the heartland of the Kingdom at the peak of its power and influence, and the remains of its ancient cities form one of the most important and breathtaking archaeological collections in the world.