Japan Data Center WatchFacilities and plans in Japan
JAEN

International connectivity

Submarine cables and data centers

A regional reference map of published data center facilities and projects alongside source-verified submarine cable landing points in Hokkaido, Tohoku, and Kyushu.

Nearby infrastructure does not prove that a data center is connected to a cable. Landing locations without a public exact address are shown at municipality level.

Region

Cable systems in region: 2Data centers: 5Projects: 0

Landing points use municipality representative points. Distances are approximate straight-line distances. Proximity does not indicate a connection. Submarine routes are not shown.

Loading map…

The location and project lists and their sources remain available if the map cannot be displayed.

Locations and sources（Hokkaido）

Ishikari (HSCS)

Service announced (2008); current status unverified

Hokkaido–Sakhalin Cable System (HSCS)

Location
北海道 石狩市 — Municipality representative point (approximate)
Cable length
570 km
Service start
Jul 2008 (service announced; current status unverified)
Operators / consortium members
NTT Communications、TransTeleCom
Nearest listed data center or project
Sakura Internet Ishikari Data Center · Approx. 34 km
Last checked
2026-09-24

Sources: Same source (HSCS overview)

NTT Com / TransTeleCom: launch of a new route using the Japan–Russia optical submarine cable

Tomakomai (E2A, planned)

Planned

E2A

Location
北海道 苫小牧市 — Municipality representative point (approximate)
Cable length
12,500 km
Service start
H2 2028 (planned service start)
Operators / consortium members
Chunghwa Telecom、SK Broadband、SoftBank、Verizon Business
Nearest listed data center or project
Hokkaido Tomakomai AI Data Center · Approx. 6 km
Last checked
2026-09-24

Sources: Same source (planned landing facilities)

SoftBank: New international submarine cable landing facilities in Hokkaido and Kyushu

Data center facilities and projects

Data and terms

Landing locations and cable details are based on public materials from the operators cited in each card. Representative points are approximate and derived from municipal boundaries in Japan's National Land Numerical Information.

TeleGeography states that public maps and screenshots may be used under CC BY-SA 4.0, while its underlying database is restricted to subscribers. This page does not reproduce its data or imagery.

View TeleGeography's Submarine Cable MapMap and data termsNational Land Numerical Information (administrative areas)