Fluvisol

The good natural fertility of most fluvisols and their attractive dwelling sites on river levees and higher parts in marine landscapes were recognized in prehistoric times.

These acid sulfate soils have severe constraints for agricultural use as low pH-values, toxic aluminium levels and high concentrations of salts.

Also in deltaic areas, e.g. the deltas of the Ganges–Brahmaputra, Indus, Mekong, Mississippi, Nile, Niger, Orinoco, Po, Rhine, Rio de la Plata, and Zambezi.

Furthermore in areas of recent marine deposits, e.g. the coastal lowlands of Sumatra, Kalimantan, Irian Jaya and Papua New Guinea.

Acid sulfate soils are found in the coastal lowlands of Southeast Asia, West Africa and along the northeast coast of South America (French Guiana, Guyana, Suriname and Venezuela).