Valley - is defined as a low area between hills and mountains. It usually occurs in streams or rivers that flow through it
Desert - land with little or no sand, little or no desert with little or no vegetation
The desert - usually defined as a conical mountain or hill, spouted out of vent lava, rock fragments, and the crust
Geographical features are features of the earth created by people or nature. Natural geographical features include topography and ecosystems. For example, the type of terrain, the physical factors of the environment are natural geographical features. In contrast, human settlements and other forms of engineering are regarded as a kind of artificial geographical features. Biodiversity in ecosystems is the difference in creatures of any origin, including land, ocean and other aquatic ecosystems. Organisms continue to establish a series of relationships with other elements that make up the environment and ecosystems describe everything that exists between organisms and the environment.
The map topography is a kind of abstract geographical feature that is displayed on the map, but is not displayed on the earth itself although it is displayed on the earth. For example, the equator is displayed on the map of the Earth but actually does not exist. It is a theoretical line for reference, navigation and measurement
The terrain does not include terrain such as canals, harbors, numerous harbors, artificial terrain, desert, forest, grassland and other terrain. Many terms are not limited to the characteristics of the Earth but can be used to describe the surface features of other planets or similar objects in the universe. For example, mountains, hills, valleys of polar areas, and valleys are found on all planets on Earth. Terrain can be extracted from the digital elevation model using several automation techniques, the data being collected by the latest satellite and stereo airborne surveillance cameras. Until recently, editing the data contained in these datasets required a time-consuming and costly method with a lot of effort. The most detailed DEM available is measured directly using LIDAR technology