"The national statistics given below are estimates based on various small scale maps and inventories that were not always up to date, reliable or both. Results therefore, in particular for small countries, are to be interpreted with care. Please note that the indicators used in the headings are fully defined in the following downloadable publication, and should be consulted to correctly indicate their meaning and limitations. Particularly, one should realize that the extent "Potential arable land" includes land presently used for other purposes such as grassland, forests, protected areas, buildings and infrastructure etc. This land is therefore in most cases not available. Note that the proportion potentially arable land presently in use may exceed 100% in (semi) arid regions where irrigation practices are common."