The finer groupings underneath a category, minted where one category would otherwise hold hundreds of entities with no way to browse them: regions by continent, landforms by physical-geography type, bodies of water by hydrology type, cities and countries by UN M49 subregion, states by administrative-division designation, physical processes by subdiscipline, protected areas by IUCN management category. A subcategory entity is the address a reader's browsing lands on and the anchor a member entity's own SubLabel points at; it is not itself a place, process or feature to be researched.