Large areas of Histosols are found in the circumpolar region of the northern hemisphere, as well as in Southeast Asia.
Soils having a histic or folic horizon (wet or dry organic horizons, respectively)
- either 10 cm or more thick if overlying a lithic or paralithic contact, or
- 40 cm or more thick and starting within 30 cm from the soil surface.
Histosols do not have an andic or vitric horizon that starts within 30 cm from the soil surface.
|Highland peat in western Ireland (Ombri-Sapric Histosol)||Strongly decomposed peat under cultivated grassland, the Netherlands