Game concept
Herder Settlement
From the game's encyclopedia
A Herder Settlement is the smallest of the Holding Types. They represent the presence of Herders in the area, and provide bonuses to the County Fertility.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Herder Settlement is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Herder Settlement is the smallest of the Holding Types." It is part of Holding Type. Patch 1.20.1.2, from game/common/game_concepts/mpo_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/mpo_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.