Article 4 — Soil districts and soil units

1. Member States shall establish, for administrative purposes, one or more soil districts which shall cover their entire territory and be under the responsibility of one or more competent authorities as designated pursuant to Article 5. 2. Member States shall establish soil units which together cover their entire territory, for the purposes of designing monitoring and of reporting with regard to soil health within a given margin of error within the soil unit concerned, taking into account: (a) the geographical extent of soil districts as established pursuant to paragraph 1; (b) the soil type as defined in the map of the soil regions of the European Union and Adjacent Countries 1:5000000, published by the Federal Institute of Geosciences and Natural Resources (BGR), in partnership with the Joint Research Centre (JRC); (c) the land use categories, excluding water bodies, as referred to in Regulation (EU) 2018/841. 3. For the purposes of establishing their soil units, Member States may use, where available at the Union, national or subnational level, updates of data referred to in paragraph 2 or more detailed data equivalent to those data. Member States may take into account additional spatial data to establish their soil units, such as data concerning the climate, environmental zones as described in the relevant scientific studies or reports, or river basins.