Submarine Cable Map

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Japan

ISO Code: JPN

68

Landing Points

50

Cables

16

Connected

182

Reachable

1.7

Redundancy

gateway

Role

Directly Connected Countries

Australia Brunei Canada China Guam Indonesia South Korea Northern Mariana Islands Malaysia Philippines Russia Singapore Thailand Taiwan United States Vietnam

Cables

5 Villages 6 Islands0 countries APCN-26 countries Apricot5 countries Asia Direct Cable (ADC)5 countries Asia Pacific Gateway (APG)7 countries Asia Submarine-cable Express (ASE)/Cahaya Malaysia4 countries Asia United Gateway East (AUG East)7 countries Australia-Japan Cable (AJC)2 countries Awashima-Murakami0 countries Candle5 countries Daito Loop0 countries E2A3 countries EAC-C2C5 countries FASTER2 countries FLAG North Asia Loop/REACH North Asia Loop3 countries Guam Okinawa Kyushu Incheon (GOKI)1 countries Hachijojima-Mainland0 countries Hokkaido-Akita Cable0 countries Hokkaido-Rebun-Rishiri0 countries Hokkaido-Sakhalin Cable System (HSCS)1 countries I-AM Cable3 countries Izu Islands Cable System0 countries JAKO1 countries Japan-Guam-Australia North (JGA-N)1 countries Japan Information Highway (JIH)0 countries JUNO1 countries JUPITER2 countries Kitadaito Island0 countries Korea-Japan Cable Network (KJCN)1 countries Minamidaito Island0 countries Mishima Village0 countries Miyazaki-Okinawa Cable (MOC)0 countries Muroran-Hachinohe0 countries New Cross Pacific (NCP) Cable System4 countries Ogasawara Cable Network0 countries Okinawa Cellular Cable0 countries Okinawa-Miyakojima-Ishigaki0 countries Okinawa Remote Islands0 countries Pacific Crossing-1 (PC-1)1 countries Proa2 countries Russia-Japan Cable Network (RJCN)1 countries Southeast Asia-Japan Cable 2 (SJC2)6 countries Southeast Asia-Japan Cable (SJC)4 countries Taihei1 countries Tata TGN-Pacific2 countries Topaz2 countries Trans-Pacific Express (TPE) Cable System4 countries Unity1 countries YUI0 countries Yuza-Tobishima0 countries

Landing Points

Aogashima, Japan

1 cables

Hachijo, Japan

4 cables

Kozushima, Japan

1 cables

Mikurashima, Japan

1 cables

Miyake, Japan

2 cables

Niijima, Japan

1 cables

Oshima, Japan

2 cables

Shikinejima, Japan

1 cables

Toshima, Japan

1 cables

Chikura, Japan

7 cables

Kitaibaraki, Japan

1 cables

Minamiboso, Japan

4 cables

Maruyama, Japan

9 cables

Shima, Japan

12 cables

Komesu, Japan

1 cables

Wada, Japan

2 cables

Awashimaura, Japan

1 cables

Murakami, Japan

1 cables

Kitadaito, Japan

2 cables

Minamidaito, Japan

2 cables

Itoshima, Japan

1 cables

Tomakomai, Japan

1 cables

Ajigaura, Japan

2 cables

Kitakyushu, Japan

2 cables

Naha, Japan

4 cables

Miura, Japan

1 cables

Akita, Japan

2 cables

Sapporo, Japan

1 cables

Rebun, Japan

1 cables

Rishirifuji, Japan

1 cables

Wakkanai, Japan

1 cables

Ishikari, Japan

2 cables

Fukuoka, Japan

3 cables

Itō, Japan

1 cables

Ibaraki, Japan

1 cables

Miyazaki, Japan

2 cables

Ninomiya, Japan

1 cables

Sendai, Japan

1 cables

Yaese, Japan

2 cables

Itoman, Japan

2 cables

Iojima, Japan

1 cables

Kuroshima, Japan

1 cables

Makurazaki, Japan

1 cables

Takeshima, Japan

1 cables

Hachinohe, Japan

1 cables

Muroran, Japan

1 cables

Chichijima, Japan

1 cables

Hahajima, Japan

1 cables

Kagoshima, Japan

1 cables

Nago, Japan

1 cables

Gusukube, Japan

1 cables

Shiraho, Japan

2 cables

Aguni, Japan

1 cables

Ama, Japan

1 cables

Hateruma, Japan

1 cables

Kumejima, Japan

1 cables

Tarama, Japan

1 cables

Tokashiki, Japan

1 cables

Yomitan, Japan

1 cables

Yonaguni, Japan

1 cables

Joetsu, Japan

1 cables

Takahagi, Japan

2 cables

Emi, Japan

1 cables

Toyohashi, Japan

1 cables

Hirara, Japan

1 cables

Nakadomari, Japan

1 cables

Tobishima, Japan

1 cables

Yuza, Japan

1 cables

182

Reachable Countries

1.7

Redundancy Score

182

Transit Dependencies

Low Redundancy Destinations

Exact bounded path counts are shown for selected direct and nearby destinations. Other destinations use approximate representative counts. 22 exact · 160 approximate

Christmas Island

Cocos (Keeling) Islands

Transit Dependencies

Score emphasizes lost reachable countries first, then lost representative paths, nearby destinations, and direct-neighbor exposure.

3 countries lost · 3 representative paths · 0 nearby

2 countries lost · 6 representative paths · 2 nearby · 1 direct

2 countries lost · 2 representative paths · 1 nearby

Congo, Dem. Rep.

2 countries lost · 2 representative paths · 0 nearby

1 countries lost · 5 representative paths · 1 nearby · 1 direct

1 countries lost · 5 representative paths · 1 nearby · 1 direct

1 countries lost · 5 representative paths · 1 nearby · 1 direct

1 countries lost · 5 representative paths · 1 nearby · 1 direct

1 countries lost · 5 representative paths · 1 nearby · 1 direct

1 countries lost · 5 representative paths · 1 nearby · 1 direct

Concentration

These are structural concentration measures from the country-topology graph. They do not represent traffic, latency, or capacity share.

24%

Top LP Share

38%

Top Gateway Share

67%

Top Cable Share

0.12

LP HHI

0.33

Gateway HHI

1.92

Cable HHI

Top Landing Points

Shima, Japan24%

Maruyama, Japan18%

Chikura, Japan14%

Hachijo, Japan8%

Minamiboso, Japan8%

Top Gateway Countries

China38%United States34%Malaysia20%Singapore12%Philippines11%

Cable Failure Impact

Australia-Japan Cable (AJC) failure

Loses: Australia

Proa failure

Loses: Northern Mariana Islands

Topaz failure

Loses: Canada

Landing Point Failure Impact

Chikura, Japan failure

Loses 7 cables

Loses: Brunei, China, Philippines, Singapore, United States

Minamiboso, Japan failure

Loses 4 cables

Loses: Guam, Indonesia, Philippines, Singapore, Taiwan

Maruyama, Japan failure

Loses 9 cables

Loses: China, Indonesia, South Korea, Malaysia, Philippines, Singapore, Thailand, Taiwan, United States, Vietnam

Shima, Japan failure

Loses 12 cables

Loses: Guam, Northern Mariana Islands

Wada, Japan failure

Loses 2 cables

Loses: Brunei, China, Indonesia, South Korea, Malaysia, Philippines, Singapore, Taiwan

Ishikari, Japan failure

Loses 2 cables

Loses: Russia

Fukuoka, Japan failure

Loses 3 cables

Loses: South Korea

Joetsu, Japan failure

Loses 1 cable

Loses: Russia

Takahagi, Japan failure

Loses 2 cables

Loses: United States

Top Combinations From Bounded Candidate Search

Results come from bounded candidate search, not exhaustive N-2 enumeration. Evaluated 5 cable candidates and 5 landing-point candidates before ranking blocked-state recomputations. 10 cable-pair · 10 landing-point-pair · 25 mixed-pair evaluations

Cable pair

5-villages-6-islands + apcn-2

0 lost direct countries

Cable pair

australia-japan-cable-ajc + 5-villages-6-islands

0 lost direct countries

Cable pair

australia-japan-cable-ajc + apcn-2

0 lost direct countries

Landing point pair

chikura-japan + minamiboso-japan

0 lost direct countries

Landing point pair

chikura-japan + wada-japan

0 lost direct countries

Role

gateway

Japan acts as a gateway because its network-relative degree, reach, or gateway-share signal is elevated; the gateway-share signal is around the 19th percentile.

Role labels are network-relative classifications derived from degree, reachable-country count, bridge coverage, and gateway concentration within the country-topology graph.

16

Degree

182

Reachable

0

Bridge Pairs

0%

Bridge Coverage

Bridge Dependencies

No strong local bridge dependencies detected.