戰略區域

A strategic region is a collection of adjacent provinces which define a broad geographical area. The world is comprised of 288 strategic regions. Note: strategic region id 15 "Asia" has 0 provinces assigned and, therefore, does not exist in-game.

Strategic regions are particularly relevant to naval warfare and air warfare, as various key mechanics (such as naval missions/air missions and naval supremacy/air superiority) apply directly to strategic regions.

Strategic region names and the player's extent of naval supremacy/air superiority within each region can be seen via the strategic navy map mode or the strategic air map mode.

Naval mechanics

Many strategic regions contain water provinces which comprise part of the world's interconnected seas and oceans. The water provinces within these regions are subject to a number of mechanics relevant to naval activity, which are described below.

Naval terrain

Naval terrains visible as different shades of blue, with the terrain mapmode enabled.

Each strategic region containing water provinces has a single naval terrain associated with all water provinces in that region. Most terrain types have bonuses and/or penalties associated with them, which are applied to ships within the associated region.

When the terrain mapmode is enabled, naval terrains are distinguished on the map as different shades of blue.

Ocean

Oceans are the only naval terrain type with no associated bonuses or penalties other than mines.

Ship type	Chance to hit mines
All ships	-75%

Shallow sea

Submarines have greater difficulty concealing themselves in these shallow waters.

Ship type	Chance to hit mines	Visibility	Positioning
Submarine	-50%	+100%	-5%
Other ships	-50%		-5%

Deep ocean

Screens suffer some combat penalties in this terrain, while capital ships experience no penalties. Submarines are slightly harder to detect here.

Ship type	Chance to hit mines	Speed	Attack	Defense	Visibility
Destroyer	-95%	-20%	-20%	-20%
Light cruiser	-95%	-10%	-10%	-10%
Submarine	-95%	-25%			-15%
Other ships	-95%

Fjords and archipelagos

Ships are more easily concealed in this intricate terrain, but capital ships suffer a range of penalties as well.

Ship type	Fuel consumption	Visibility	Positioning	Speed	Attack	Defense
Capital ships	+20%	-20%	-15%	-20%	-20%	-20%
Other ships		-20%	-15%

Naval modifiers

Strategic regions containing water provinces may have modifiers which specifically affect naval activity in the region. When a water province within such a region is selected, these modifiers (if any) are indicated by small icons over the corner of the naval terrain graphic.

The effects of any modifiers present are stacked with any effects from naval terrain.

Bad weather

Depending upon weather in the region, naval modifiers may be temporarily applied.

These modifiers have various effects upon naval activity in the afflicted regions:

	Naval strike	Carrier traffic	Naval hit chance	Naval speed	Naval detection	Retreat speed	Positioning
Light Rain	-20%		-5%	-5%	-10%	+5%
Heavy Rain	-40%	-80%	-20%	-10%	-20%	+10%	-10%
Snow	-30%		-5%	-5%	-15%	+5%	-10%
Blizzard	-40%	-100%	-10%	-10%	-30%	+15%	-20%
Sandstorm	-90%

Arctic water

This modifier applies permanently to some strategic regions in the north (e.g. the Bering Sea).

It has the following effects:

• -5% speed while retreating
• +20% casualties on sink
• +10% attrition
• -20% positioning

Shark infested waters

This modifier applies permanently to various strategic regions which have historically been associated with shark attacks. When a ship is sunk in one of these regions (e.g. the Solomon Sea), crew casualties are increased by +60%. Any extra casualties from the shark infested waters are not counted as being inflicted by the nation that sunk the ship, but are instead listed under 「unknown.」

Naval access level

When a strategic region containing water provinces is selected, the access level of that region can be manually configured by the player.

These access levels only apply to the player's own ships, and are applicable to convoys in addition to warships with the exclusion of manual orders.

Access level	Effect
Allowed	Our Fleets and Trade routes will move through this region as normal.
Avoid	Our Fleets and Trade routes will try to avoid this region, unless there is no other route.
Blocked	Our Trade routes will never pass through this region. Our Fleets will never pass through this region, unless there is no other route.

At the start of the game, all such regions are initialised to the Allowed access level.

List of strategic regions

Table

ID	In-game Name	File Name	Province Count
1	Southern England	Southern England	43
2	Northern England	Northern England	29
3	Scotland	Scotland and Northern Ireland	37
4	Ireland	Ireland	34
5	Benelux Region	Benelux Region	39
6	North-West Germany	North-West Germany	38
7	Western Germany	Western Germany	85
8	Eastern Germany	Eastern Germany	87
9	Gulf of Finland	Baltic Sea	3
10	Southern Sweden	Southern Sweden	78
11	Southern Norway	Southern Norway	90
12	Kola	Northern Scandinavia	33
13	Eastern Finland	Finland	63
14	Trans-Urals	TransUrals	84
15		Asia	0
16	North Sea	North Sea	15
17	Ethiopian Highlands	Africa	20
18	English Channel	Channel	19
19	Northern France	Northern France	75
20	Southern France	Southern France	109
21	Alpine Region	Alpine Region	102
22	Czechoslavakia	Czechoslavakia	61
23	Italy	Italy	70
24	Western Balkans	Western Balkans	118
25	Greece	Greece	49
26	Eastern Balkans	Eastern Balkans	92
27	Northern Balkans	Northern Balkans	81
28	Middle East	Middle East	43
29	Central Mediterranean Sea	Central Mediterranean Sea	11
30	Black Sea	Black Sea	7
31	Deccan Plateau	Indian Area	54
32	South-Eastern Pacific	Southern Ocean	95
33	Alaska	North America	15
34	Central America	Central America	20
35	Pampas	South America	36
36	Greenland	Atlantic Ocean	5
37	Baltic States	Baltic States	77
38	Western Poland	Western Poland	83
39	Eastern Poland	Eastern Poland	83
40	Transvolga	Western Russia	209
41	Northeastern Iberia	Northeastern Iberia	85
42	Bay of Biscay	Bay of Biscay	9
43	Western Approaches	Western Approaches	35
44	Denmark Strait	Denmark Strait	26
45	Norwegian Sea	Norwegian Sea	37
46	Barents Sea	Barents Sea	15
47	Iberian Coast	Spanish Coast	23
48	African Coast	African Coast	17
49	North Atlantic Ridge	Mid Atlantic 1	31
50	Labrador Sea	Labrador Sea	48
51	Mid Atlantic gap	Mid atlantic 2	26
52	Gulf of Mexico	Gulf of Mexico	10
53	Caribbean Sea	Caribbean	68
54	Eastern Seaboard	Eastern Seaboard	9
55	Newfoundland Sea	Newfoundland Sea	11
56	Mid Atlantic	Mid Atlantic 3	26
57	Sargasso Sea	Mid Atlantic 4	36
58	Central Atlantic Gap	Mid Atlantic 5	28
59	Demerara Plain	Mid Atlantic 6	45
60	West Indian Ocean	West Indian Ocean	99
61	Cap Verde Plain	Central Atlantic	45
62	Gulf of Guinea	Cape Approach	109
63	Argentine Coast	Argintine Coast	28
64	South Georgia Sea	Super Southern atlantic 1	86
65	Cape of Africa	Cape of Africa	45
66	South Central Atlantic	South central atlantic 1	92
67	Atlantic-Indian Ridge	Super south atlantic 2	47
68	Western Mediterranean Sea	Western Mediterranean Sea	17
69	Eastern Mediterranean Sea	Eastern mediterranean Sea	14
70	Caspian Sea	Caspian Sea	4
71	East Indian Ocean	East Indian Ocean	62
72	Straits of Malacca	Straits of Malacca	10
73	Gulf of Thailand	Gulf of Thailand	6
74	South East Indian Ocean	South East Indian Ocean	76
75	South China Sea	South China Sea	31
76	East China Sea	East China Sea	27
77	Yellow Sea	Yellow Sea	6
78	Philippine Sea	Philippine Sea	35
79	Sea of Japan	Sea of Japan	16
80	Celebes Sea	Celebes Sea	10
81	Coral Sea	Coral Sea	23
82	Gulf of Carpentaria	Gulf of Carpentaria	5
83	Solomon Sea	Solomon Sea	48
84	Bismarck Sea	Bismarck Sea	63
85	South West Indian Ocean	South West Indian Ocean	97
86	Tasman Sea	Tasman Sea	42
87	Sea of Okhotsk	Sea of Okhotsk	38
88	Bering Sea	Bering Sea	68
89	Western Seaboard	Western Seaboard	10
90	Coast of Japan	Coast of Japan	17
91	Arafura Sea	Arafura Sea	14
92	Timor Sea	Timor Sea	17
93	Java Sea	Banda Sea	57
94	Mariana Region	Western Pacific	44
95	West Emperor Chain	Western pacific 2	60
96	North Emperor Chain	North West Pacific	52
97	Eastern Micronesia	South West Pacific	83
98	Great Australian Bight	Great Austrialian Blight	36
99	Far Eastern Indian Ocean	Far Eastern Indian Ocean	83
100	Red Sea	Red Sea	9
101	Bay of Bengal	Bay of Bengal	39
102	East African Coast	East African Coast	23
103	Mozambique Channel	Mozambique Channel	12
104	Arabian Sea	Arabian Sea	28
105	Hawaii Ridge	Eastern Pacific 1	68
106	Mexican Coast	Mexican Coast	27
107	Western Canal zone	Western Canal zone	16
108	South American coast	South American coast	31
109	Peruvian Coast	Peruvian Coast	24
110	East Pacific Rise	East Pacific 2	67
111	North Central Pacific	East Pacific 3	60
112	Far South Pacific	Far South Pacific	77
113	South Central Pacific	South Pacific	39
114	North Pacific	North Pacific	40
115	North East Pacific	North East Pacific	34
116	Central Iranian Range	Iran	30
117	East Coast	East Coast	101
118	Cascades	West Coast	45
119	South West	South West	65
120	Central USA	Central USA	106
121	Eastern Canada	Eastern Canada	51
122	Yukon	Western Canada	3
123	Transvolcanic Belt	Mexico	27
124	Northern South America	Northern South America	52
125	Brazil	Brazil	44
126	Eastern Maghreb	North Africa	67
127	Sahara Desert	Saharadesert	69
128	Egypt	Egypt	55
129	Asia minor	Asia minor	169
130	Ukraine	Ukraine	171
131	Belarus	Belarus	110
132	Novgorod	Northern Front	133
133	Central Russia	Central Russia	279
134	Caucasus Region	Caucasus Region	66
135	Kuban Region	Taman Region	131
136	Alash	Great Steppe	106
137	Western Steppe	Western Steppe	209
138	Ural Region	Ural Region	27
139	South Africa	South Africa	31
140	Sub-Saharan Africa	Sub-Sarhan Africa	64
141	Eastern India	East India	73
142	North Indochina	South East Asia	66
143	Northern China	Eastern China	67
144	Western China	Western China	39
145	Taklamakan	Central Asia	22
146	Himalayas	Himalayas	28
147	Northern Siberia	Siberian Region	22
148	Russian Far East	Russian Far East	62
149	Eastern Siberia	Eastern Siberia	42
150	Archangelsk	Artic Russia	121
151	Western Siberia	Western Siberia	57
152	Outer Mongolia	Central Steppe	56
153	Northern India	Northern India	36
154	Home Islands	Home Islands	108
155	Western Manchuria	Manchuria	75
156	Southern Australia	Austrialia	48
157	New Zealand	New Nealand	40
158	Sunda Islands	Guinea	40
159	Borneo	Borneo	67
160	Philippines	Philippines	77
161	Iceland	Iceland	7
162	Afghanistan	Afghanistan Area	33
163	Amazonas	Amazonian Brazil	61
164	Eastern China	South East China	75
165	Southern China	South West China	49
166	Hudson Bay	Hudson Bay	14
167	New Guinea	New Guinea	72
168	Adriatic Sea	Adriatic Sea	4
169	Tyrrhenian Sea	Tyrrhenian Sea	17
170	Florida Coast	Florida Coast	22
171	Northwest Coast	Northwest Coast	29
172	Pacific Line Ridge	South Central Pacific	49
173	Eastern North Sea	Eastern North Sea	10
174	Norwegian Coast	Norwegian Coast	9
175	Central Pacific	Southeastern Central Pacific	53
176	Central North Pacific	Central North Pacific	53
177	Western North Pacific	Western North Pacific	25
178	West Polynesia	West Polynesia	38
179	French Polynesia	French Polynesia	40
180	Micronesian Gap	Micronesian Gap	26
181	Madagascar	Madagascar	10
182	Western Maghreb	North West Africa	44
183	Central Africa	Central Africa	20
184	Cameroon	South West Africa	13
185	South East Africa	South East Africa	20
186	Korea	Korea	69
187	Sumatra	Sumatra	56
188	Malaya	Malaya	44
189	Burma	Burma	85
190	Pakistan	Pakistan	48
191	Northern Norway	Northern Norway	45
192	Lower Norrland	Northern Sweden	63
193	Northern Australia	Northern Australia	35
194	Eastern Australia	Eastern Australia	117
195	Central Australia	Central Australia	29
196	Central Arabia	Arabian Coast	17
197	New England	New England	66
198	Great Lakes	Midwest	112
199	Northern Rockies	Rocky Mountains	49
200	Quinghai	Quinghai	25
201	Northern Andes	Northern Andes	33
202	Aegean Sea	Aegean Sea	13
203	Persian Gulf	Persian Gulf	5
204	Sierra Madre	Sierra Madre	48
205	Yucatan Peninsula	Yucatan Peninsula	16
206	Lower Baltic Sea	Lower Baltic Sea	10
207	Danish Belts	Danish Belts	3
208	Western France	Western France	46
209	Northwestern Iberia	Northwestern Iberia	87
210	Southern Iberia	Southern Iberia	93
211	Gulf Coast	Gulf Coast	93
212	Manitoba	Central Canada	26
213	Maritimes	Maritimes	16
214	Appalachia	Appalachia	42
215	Namibia	Namibia	14
216	Upper Nile	Upper Nile	44
217	Lake Victoria	Lake Victoria	42
218	California	California	71
219	Southern Rockies	Southern Rockies	60
220	Labrador and Newfoundland	Labrador and Newfoundland	20
221	Saskatchewan	Saskatchewan	40
222	Northern Canada	Northern Canada	14
223	Zambezi	North South Africa	22
224	Angola	Angola	15
225	Tripoli	Tripoli	55
226	West Africa	West Africa	25
227	North East Congo	Congo	17
228	South Indochina	South Indochina	57
229	Siam	Siam	53
230	Cape Comorin	Cape Comorin	32
231	East Ghats	Coromandel Coast	42
232	Levant	Levant	46
233	Quebec	Quebec	37
234	Ontario Region	Ontario Region	30
235	British Columbia	British Columbia	37
236	South Arabia	South Arabia	22
237	Hejaz	Hejaz	20
238	East Arabia	East Arabia	19
239	Alborz	Alborz	22
240	Zagros	Zagros	21
241	Dasht-e kavir	Dasht-e kavir	16
242	Northern Manchuria	Northern Manchuria	40
243	Eastern Manchuria	Eastern Manchuria	73
244	Chahar	Chahar	38
245	Shanxi Region	Shanxi Region	41
246	Central China	Central China	62
247	Yantze River Region	Yantze River Region	93
248	Guangxi	Guangxi	75
249	Yunnan	Yunnan	25
250	Kham	Kham	22
251	Ngari	Ngari	11
252	Tien Shan	Tien Shan	34
253	Vindhyachal	Vindhyachal	33
254	Thar Desert	Thar Desert	35
255	Amur	Amur	49
256	Transbaikal	Transbaikal	49
257	Northern Far East	Northern Far East	13
258	Okhotsk	Okhotsk	14
259	Eastern Sakha	Sakha	12
260	Western Sakha	Western Sakha	29
261	Altai	Altai	30
262	Central Siberia	Central Siberia	41
263	Trans-Ural Nenetsia	Eastern Nenetsia	19
264	Komi-Nenetsia	Komi-Nenetsia	46
265	East Karelia	East Karelia	59
266	Uriankhai	Uriankhai	32
267	Tanscaspia	Tanscaspia	59
268	Ferghana	Ferghana	48
269	Samarkand	Samarkand	27
270	Syr Darya	Syr Darya	57
271	South East Congo	South West Congo	15
272	West Congo	West Congo	22
273	Danakil	Danakil	18
274	Ogaden	Ogaden	31
275	Jutland Peninsula	Jutland Peninsula	31
276	Northern Norrland	Northern Norrland	66
277	Northern Finland	Northern Finland	60
278	Western Finland	Western Finland	50
279	Gulf of Bothnia	Gulf of Bothnia	6
280	Guiana	Guiana	24
281	Gran Chaco	Gran Chaco	24
282	Rio Grande do Sul	Rio Grande	45
283	Patagonia	Patagonia	40
284	Southern Andes	Southern Andes	38
285	Rio Tocantins	Rio Tocantins	18
286	Rio Grande do Norte	Rio Grande do Norte	42
287	Bolivia	Bolivia	25
288	Central Brazil	Central Brazil	14