A region is the highest level of geographical organization in the game, formed by groupings of 省份.
Region mechanics
Each region can be administered by a 
governor, who give various bonuses or maluses to all owned provinces and territories in the region based on their traits and attributes. Additionally, an army can be assigned to a region, with the region's governor becoming its general. Each cohort in this army lowers 
unrest in each of the region's provinces, based on the number of cohorts compared to the population of the entire region, but the army cannot move outside of its assigned region while assigned.
Capital region
The region containing a nation's capital city is the nation's capital region. The capital region is always governed by the nation's 
ruler, with the effects of his/her attributes and traits applied to all provinces and territories in the capital region as if the ruler was a governor.
Every state/territory in the capital region gets the following modifiers:
+10% Population Output
+0.05 Local Provincial Loyalty
Note that this modifier, particularly the population output bonus, stacks with the modifiers for the capital province and territory.
As the capital region does not have a governor who takes a portion of the income, is more loyal than other regions of the state, and helps the ruler with their power base, full control is recommended before expansion elsewhere.
List of regions
| Region | Provinces | ID |
|---|---|---|
| Africa | Byssatis, Carthago, Emporia, Maxyesia, Musulamia, Thabracania, Zeugitana | africa_region |
| Albania | Arran, Artshak, Caucasian Albania, Kahetia, Paytankert, Sarmatia Hyrcania, Scythia Transmontem | albania_region |
| Aparanta | Anupa, Aparanta, Asika, Kuntala, Mulaka, North Sahyadri, South Sahyadri, Vindhya | aparanta_region |
| Aquitania | Aquitania, Auscia, Biggeronia, Celtica, Lemovicia, Nitiobrogia, Pictonia, Santonia | aquitaine_region |
| Arabia | Arabia Ad Sinus, Arabia Maritimae, Arabia Relicta, Dedan, Iathrippa, Taifa | arabia_region |
| Arabia Felix | Arabia Felix Centralis, Arabia Felix Occidentalis, Arabia Felix Orientalis, Hadhramut Occidentalis, Hadhramut Orientalis, Qataba, Saba | arabia_felix_region |
| Ariana | Arachosia, Arcticene, Aria, Carmania, Drangiana, Pactya, Sagartia | ariana_region |
| Armenia | Armenia Superior, Ayrarat, Parsatunik, Parskahayk, Soducene, Syracene, Syunik, Tarawn, Vaspurakan | armenia_region |
| Armorica | Armorica, Carnutia, Eburovicia, Namnetia, Osisimia, Turonia, Venellia | armorica_region |
| Asia | Aeolia, Caria Litoralis, Caria Mediterraneus, Ionia, Lydia, Mysia, Mysia Abrettene | asia_region |
| Assyria | Adiabene, Assyria, Comagene, Corduene, Mesopotamia Superior, Osroene, Sophene | assyria_region |
| Avanti | Anartta, Avanti, Dahala, Dasarna, Madhyamika, Maru, Matsya, Shurasena | avanti_region |
| Bactriana | Bactria, Candara, Margiana, Oxiana, Paropamisadae, Sattagydia, Transoxus | bactriana_region |
| Baetica | Baetica Cordubensis, Baetica Gaditanus, Baetica Hispalensis, Bastetania, Couneia, Malacitia, Oretania, Turdetania Occidentalis, Turdulia Orientalis | baetica_region |
| Belgica | Bellovacia, Eburonia, Morinia, Nervia, Suaeuconia, Treveria, Treveria Salutaris, Veliocassia | belgica_region |
| Bithynia | Bithynia, Bithynia Inferior, Bithynia Superior, Heracleotis, Machelonia, Paphlagonia Inferior, Paphlagonia Superior, Pontus | bithynia_region |
| Boiohaemum | Baluconia, Boioa, Buria, Hermunduria, Marcomannia, Naharvalia, Naristia, Vindelicia | bohemia_area |
| Britannia | Brigantia, Cantiacia, Coritania, Cornovia, Demetia, Dobunnia, Dumnonia, Durotrigia, Icenia, Ordovicia | britain_region |
| Caledonia | Caledonia, Hibernia Meridionalis, Hibernia Occidentalis, Hibernia Orientalis, Hibernia Septentrionalis, Taexalia, Votadinia | caledonia_region |
| Cappadocia | Armenia Maior, Armenia Minor, Cappadocia, Cappadocia Cataonia, Cappadocia Garsauritis, Cappadocia Melitene, Cappadocia Saravene, Pontus Colopene | cappadocia_region |
| Celtica | Ambarria, Biturigia, Cubia, Haeduia, Parisia, Senonia, Sequania | central_gaul_region |
| Cilicia | Cilicia Pedias, Cilicia Trachea, Cyprus, Lycia, Milyas, Pamphylia, Pisidia | cilicia_region |
| Cisalpine Gaul | Aemilla, Cenomannia, Insubria, Liguria, Olana, Transpadana, Vallis Arni, Venetia | cisalpine_gaul_region |
| Colchis | Abasgoi, Bekhyria, Caucasian Iberia, Colchis, Gugark, Suaneti, Tayk | colchis_region |
| Contestania | Balearides, Carpetania, Celtiberia Meridionalis, Contestania Meridionalis, Contestania Septentrionalis, Edetania, Lobetania, Mastiania | contestania_region |
| Cyrenaica | Ammon, Barka, Cyrenaica, Libya, Marmarica, Syrtica, Tripolitania | cyrenaica_region |
| Dacia | Albocensia, Apulensis, Costobocia, Cotinia, Iazygia, Porolissensis, Potulatensia | dacia_region |
| Dravida | Koda, Malayas, North Tambapamni, North Tondainadu, Pandiya, South Tambapamni, South Tondainadu, Sriparvata | dravida_region |
| Gallaecia | Asturia Meridionalis, Asturia Septentrionalis, Callaecia Meridionalis, Callaecia Septentrionalis, Cantabria, Vaccaeia Meridionalis, Vaccaeia Septentrionalis | gallaecia_region |
| Gandhara | Gandhara, Glausae, Kasmira, Madra, Panchanada, Sibae, Trigata | gandhara_region |
| Gedrosia | East Omana, Gedrosia, Gerrha, Parecania, Patalene, Rudiana, West Omana | gedrosia_region |
| Germania | Bructeria, Chamavia, Chasuaria, Chaucia, Frisia, Langobardia, Pharodenia, Semnonia, Sicambria | germania_region |
| Germania Superior | Chattia, Latobrigia, Leucia, Mediomatricia, Tribocia, Vangionia | germania_superior_region |
| Greece | Achaea, Aegean Islands, Aetolia, Arcadia, Attica, Boeotia, Crete, Epirus, Euboea, Laconia | greece_region |
| Himalaya | Gilgit, North Tarim Basin, Pamir, Shule, South Tarim Basin, Suvarna Gotra, Zhangzhung | himalayan_region |
| Illyria | Cataria, Dalmatia, Daorsia, Deuria, Histria, Illyria Graeca, Libernia | illyria_region |
| Italia | Ariminum, Aternum, Corsica, Dodecapolis, Latium, Picenum, Sardinia Australis, Sardinia Borealis, Tuscia | central_italy_region |
| Karnata | Keralaputa, North Mahismandala, North Satiyaputa, South Mahismandala, South Satiyaputa, Vanavasi | karnata_region |
| Lower Egypt | Central Delta, Eastern Delta, Heptanomis, Memphis, Parva, Sinai, Western Delta | lower_egypt_region |
| Lusitania | Aebocosia, Celticia Maoioris, Celticia Minoris, Lusitania Meridionalis, Lusitania Septentrionalis, Oppidania, Turdulia Occidentalis, Vettonia Meridionalis, Vettonia Septentrionalis | lusitania_region |
| Macedonia | Chalkidiki, Dardania, Dindaria, Emathia, Paeonia, Pelagonia, Thessaly | macedonia_region |
| Madhyadesa | Ahicchatra, East Cedi, Kasi, Kosala, Kuru, Malla, Pancala, Sthanisvara, West Cedi | madhyadesa_region |
| Magna Graecia | Apulia, Calabria, Campania, Lucania, Sicania, Siculia, Syracuse, Tarentum | magna_graecia_region |
| Maru | Abhiria, Inner Saurashtra, Kaccha, Outer Saurashtra, Oxydracae, Pardene, Sauvira | maru_region |
| Mauretania | Massaesylia, Mauretania, Metagonia, Rutubis, Tadla, Tingitania | mauretainia_region |
| Media | Amardioi, Choarene, Kadousioi, Kossioi, Media, Media Atropatene, Media Choromithrene, Media Magna, Paraetacene | media_region |
| Mesopotamia | Apolloniatis, Aramaea, Babylonia, Chaldaea, Characene, Garamaea, Sittacene, Sumer | mesopotamia_region |
| Moesia | Getia, Malvensis, Moesia, Picensia, Roxolania, Saldensia, Scordiscia, Tricornensia | moesia_region |
| Nubia | Alana, Alut, Aswan, Meroe, Napata, North Nubia, South Nubia | nubia_region |
| Numidia | Aurasius, Cirtania, Gaetulia, Iolia, Machuria, Massylia, Sitifensia, Zaba | numidia_region |
| Palestine | Arabia Petrea, Decapolis, Galilee, Judea, Peraea, Philistia, Samaria | palestine_region |
| Pannonia | Carnuntia, Hercuniatia, Latobicia, Pannonia Prima, Pannonia Secunda, Quadia, Valeria, Varciania | pannonia_region |
| Parthia | Comisene, Hyrcania, Parnia, Parthia, Siracene, Tapuria, Traxiane | parthia_region |
| Persis | Mardiene, Media Felix, Persis, Susiana, Tabiene, Taocene, Utia | persis_region |
| Phrygia | Galatia, Galatia Trocmi, Isauria, Lycaonia, Phrygia Epictetus, Phrygia Pacatiana, Phrygia Parorea | galatia_region |
| Pracya | Anga, Kamarupa, Kamata, Magadha, Pundra, Samatata, Vanga, Vrji | pracya_region |
| Punt | Aksum, Atbaras, Mosylon, Ptolemais of the Hunt, Punt, Tana | punt_region |
| Rhaetia | Alpes Carniae, Alpes Graiae, Alpes Raetiae, Breunia, Helvetia, Noricum, Verbigenia | rhaetia_region |
| Sarmatia Asiatica | Alania, Alania Orientalis, Borysthenia Maioris, Confluenta, Danaia, Danaia Superioris, Mantessa | sarmatia_asiatica_region |
| Sarmatia Europea | Borysthenia, Clepia, Hypania, Hypania Minoris, Olbia, Sarmatia, Sarmatia Superioris, Transborysthenia, Transhypania | sarmatia_europea_region |
| Scandia | Anglia, Cimbrica, East Gothia, Herulia, Scandia Insula, Ultima Thule, West Gothia | scandinavia_region |
| Scythia | Atara, Chorasmia, Dahaea, Darn, Hyrcania Superior, Scythia Ad Pontem, Scythia Magna, Scythia Ultima, Transhyrcania | scythia_region |
| Sogdiana | Chach, Chomaria, Ferghana, Jaxartia, Kyreschata, Sogdiana, Talas | sogdiana_region |
| Syria | Apamene, North Phoenicia, Palmyrene, South Phoenicia, Syria, Syria Coele, Syria Cyrrestice | syria_region |
| Tarraconensis | Autrigonia, Celtiberia Centralis, Celtiberia Septentrionalis, Cessetania, Ilercavonia, Ilergetia, Indicetia, Vardulia, Vasconia | tarraconensis_region |
| Taurica | Borysthenia Minoris, Bosproranum, Maeotia, Maeotia Minores, Sattara, Sindica, Tanaissa, Taurica | taurica_region |
| Thrace | Crobyzoia, Europa, Haemimontus, Rhodope, Scythia, Thracia, Triballia | thrace_region |
| Tibet | Chomolangma, Jangtang, Lhasa, Sumpa, Tsang, Yarlung | tibet_region |
| Transalpine Gaul | Allobrogia, Alpes Cottiae, Alpes Maritimae, Arvernia, Narbonensis, Vocontia, Volcatia | transalpine_gaul_region |
| Upper Egypt | Asyut, Farfara, Kharga, Khargana, Luxor, Myos Hormos, Troglodytica | upper_egypt_region |
| Venedia | Chrononia, Elysia, Helveconia, Lugia, Marsignia, Rugia, Sciria, Turuntia, Venedia Inferior | venedia_region |
| Vindhyaprstha | Andhra, Asmaka, Dakshina Kosala, Fanindrapura, Kalinga, Mahendragiri, Radha, Vidarbha | vindhyaprstha_region |
| Vistulia | Amadocia, Bassetia, Ciscarpathia, Ossioia, Subcarpathia, Vistulia, Vistulia Inferioris, Zargidava | vistulia_region |