High Egypt and Low Egypt-高埃及和低埃及

At the time of the Ancient Egyptians Egypt was divided in two country: High and Low Egypt. 

The High Egypt enclosed all the Nile's Valley from Assuan to Heliopolis (beside the hodiernal Cairo). The Low Egypt, instead, took up all the area of the Nile's Delta. But why the Egyptians divided their land orientated themselves contrarily? The answer is because they oriented themselves to the geographical south, where the Nile rises ( Victoria Lake, in the center of Africa).

the highest and the lowest in the world-世界最高和世界最低

The Mount Everest  is the highest mountain in the world.
The Mariana Trench is the deepest part of the world's oceans, and the lowest elevation of the surface of the Earth's crust.

high and low altitude of USA-美国的高纬度和低纬度

In the case of the altitude of the United States. State of Colorado is the symbol of high altitude and the Hawii that of low one.

sunrise and sunset-日出和日落

The beauty of the sunrise and sunset is a good demonstration of the theme: High and Low. When we sitting on the beach or standing on high mountain, we can see the sun  rise from the sea level higher and higher in dawn and sink into sea at dusk lower and lower...

population density-人口密度

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.Several of the most densely-populated territories in the world are city-states, microstates, micronations, or dependencies. These territories share a relatively small area and a high urbanization level, with an economically specialized city population drawing also on rural resources outside the area, illustrating the difference between high population density and overpopulation.

the difference lies in the height-区别取决于高度

The images represent two very famous places but at the same time opposing. The Grand Canyon (picture left) is a very characteristic for its high and spectacular views. Instead, the Caribbean (right) show that the low altitude may have a only charm.

altitudes-海拔高度

The two territories in the picture, the Tibet which is called the Roof of the World and the Netherlands whose land is mostly under the sea level represent two examples of high and low altitude in geography.