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The most common type of organic soils is peat soils, which have been built up over ages in wetlands by the accumulation of partially digested and unrecompensed plant leftovers. The other type of organic soil is muck, which also forms as a result of the buildup of organic soil materials, but in which the sources of the materials are obscure and the contents are rather well degraded. In order for deep organic soils or Histosols to develop, the substratum must be saturated or submerged in addition to the total absence of free oxygen. On the other hand, a peat land is a sizable area of peat land. Peat lands make up more than 50% of all wetlands in the world; they occupy 3% of the planet's surface in terms of land and freshwater. Peat soils can grow in mires (bogs, fens), swamps, marshes, and pocosins, among other forms of wetlands. All regions have peat soils; however they are more common in the Northern Hemisphere's cold and temperate zones. Peat lands cover 12.2 million hectares (m ha) of land in Africa, 23.5 million ha in Asia.