Areas like swamps, marshes and low-lying coastal areas are constantly waterlogged or flooded with water, while deserts are too dry to be of much use to us. Land can also be damaged through mining or poor farming practices. These types of land are of little use to us if left in their original state.
Even where land is suitable for human use,not all of it is available to us as they may be reserved for certain uses, such as water catchment areas. These are usually areas of forests that collect and channel rainwater into reservoirs. Land is also set aside for military purposes -- such as training areas and water catchment areas take up more than half of the total land. That leaves a limited area of land for others purposes such as industry and housing.
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