set_adventure_location_effect

set_adventure_location_effect = {
	save_temporary_scope_value_as = {
		name = allow_no_destination_option
		value = $NO_DESTINATION$
	}
	hidden_effect = { #If they haven't specified where they're going we decide it here (might still leave it up to the sponsor if allow_no_destination_option = yes!)
		$BASE_SCOPE$ = {
			if = {
				limit = {
					NOT = { exists = var:adventure_destination }
				}
				random_list = {
					10 = {
						# Africa
						trigger = {
							trigger_if = {
								limit = { exists = location }
								location = {
									NOT = { geographical_region = world_africa }
								}
								adventurer_potential_destination_distance_check = {
									REGION = world_africa
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:africa
						}
					}
					10 = {
						# West Africa
						trigger = {
							trigger_if = {
								limit = { exists = location }
								adventurer_potential_destination_distance_check = {
									REGION = world_africa_west
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:africa_west
						}
					}
					10 = {
						# North Africa
						trigger = {
							trigger_if = {
								limit = { exists = location }
								adventurer_potential_destination_distance_check = {
									REGION = world_africa_north
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:africa_north
						}
					}
					10 = {
						# East Africa
						trigger = {
							trigger_if = {
								limit = { exists = location }
								adventurer_potential_destination_distance_check = {
									REGION = world_africa_east
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:africa_east
						}
					}
					10 = {
						# Europe
						trigger = {
							trigger_if = {
								limit = { exists = location }
								location = {
									NOT = { geographical_region = world_europe }
								}
								adventurer_potential_destination_distance_check = {
									REGION = world_europe
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:europe
						}
					}
					5 = {
						# North Europe
						trigger = {
							trigger_if = {
								limit = { exists = location }
								adventurer_potential_destination_distance_check = {
									REGION = world_europe_north
								}
							}
						}
						set_variable = {
							name = adventure_destination
							value = flag:europe_north
						}
					}
					10 = {
						# South Europe
						trigger = {
							trigger_if = {
								limit = { exists = location }
								adventurer_potential_destination_distance_check = {
									REGION = world_europe_south
								}
							}
						}
						set_variable = {
							name = adventure_destination

As written in game/common/scripted_effects/00_ep1_inspiration_effects.txt.