Peat is a material of vegetal origin, that forms in different types and sizes of water fields or in very humid areas from the incomplete conversion of dead vegetal residues. The natural environments where peat generally builds up are called “peat-bogs”. Peat-bogs mainly form in the cold and humid regions of the earth (northern Europe, Siberia, Alaska, Canada, etc.) and in special “niches” along the equatorial belt. In Italy, there are comparatively few peat-bogs (approximately 10,000 hectares of the surface), and can mainly be found in enclosed Alpine valleys, where meteoric water can not drain off quickly, and near natural basins, river deltas and low-lying coastal plains.