From what I remember ftom modding and just playing games from a while ago, often there is “level geometry” (which can be subdivided into parts if needed), for example, ground and hills in Fallout, city block in GTA; and then there is “decor”, repeated assets, such as trees, fences, pipes, obstacles, etc. This asset repetition is particularly noticeable in Fallout 3/NV, and somewhat in Stalker (mostly on abandoned cars)