cultures_share_relevant_region_trigger

cultures_share_relevant_region_trigger = {
	OR = {
		AND = {
			culture_overlaps_geographical_region = world_europe
			scope:culture = {
				culture_overlaps_geographical_region = world_europe
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_asia_minor
			scope:culture = {
				culture_overlaps_geographical_region = world_asia_minor
			}
		}
		AND = {
			OR = {
				culture_overlaps_geographical_region = world_middle_east
				culture_overlaps_geographical_region = world_middle_east_persia
			}
			scope:culture = {
				OR = {
					culture_overlaps_geographical_region = world_middle_east
					culture_overlaps_geographical_region = world_middle_east_persia
				}
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_steppe
			scope:culture = {
				culture_overlaps_geographical_region = world_steppe
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_tibet
			scope:culture = {
				culture_overlaps_geographical_region = world_tibet
			}
		}
		AND = {
			OR = {
				culture_overlaps_geographical_region = world_india
				culture_overlaps_geographical_region = world_burma
			}
			scope:culture = {
				OR = {
					culture_overlaps_geographical_region = world_india
					culture_overlaps_geographical_region = world_burma
				}
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_africa
			scope:culture = {
				culture_overlaps_geographical_region = world_africa
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_asia_china
			scope:culture = {
				culture_overlaps_geographical_region = world_asia_china
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_asia_china
			scope:culture = {
				culture_overlaps_geographical_region = world_asia_korea
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_asia_china
			scope:culture = {
				culture_overlaps_geographical_region = world_asia_southeast_mainland
			}
		}
		AND = {
			culture_overlaps_geographical_region = world_asia_japan
			scope:culture = {
				culture_overlaps_geographical_region = world_asia_japan
			}
		}
	}
}

As written in game/common/scripted_triggers/00_cultural_triggers.txt.