Semarang, Indonesia

Semarang, Indonesia: Submarine Cable Landing Point

Semarang is the capital and largest city of Central Java province, situated on the northern coast of Java, Indonesia. As a coastal city with a long history as a port, Semarang forms part of Indonesia's submarine cable network. One submarine cable currently lands at Semarang, connecting it to the broader domestic cable infrastructure of the Indonesian archipelago.

The cable landing here, Barat Timur Indonesia-2 (BTI-2), is a domestic system linking multiple points within Indonesia. This positions Semarang as a node in an intra-national submarine cable corridor, supporting connectivity between Indonesian islands rather than providing direct intercontinental links. Indonesia's vast archipelagic geography makes such domestic submarine cables a practical means of extending network reach between its many islands and coastal cities.

Cables Landing at Semarang

Barat Timur Indonesia-2 (BTI-2) is a submarine cable system with a total length of 11,600 kilometres currently at draft status. The cable connects multiple landing points within Indonesia, making it an entirely domestic system. With a length of 11,600 km, BTI-2 is a substantial intra-national cable, reflecting the scale of Indonesia's island geography and the distances involved in linking its scattered coastal communities and population centres by submarine fibre.

Regional Context

Within Indonesia's submarine cable landscape, Semarang ranks among the top 62% of the country's 139 landing points by cable count, hosting one cable. This places it well behind major Indonesian cable hubs such as Batam (20 cables), Jakarta (9 cables), Tanjung Pakis (9 cables), and Manado (8 cables), as well as mid-tier landing points including Dumai (7 cables) and Makassar (6 cables). Semarang currently serves as a smaller-scale landing point within what is one of the world's most extensive national submarine cable networks, spread across 139 landing points and 70 cables in total.

Network Role

Semarang functions as a single-cable terminus in Indonesia's domestic submarine cable graph. The BTI-2 system, at 11,600 km, enables connectivity between Indonesian landing points, and Semarang's inclusion on this route extends domestic submarine capacity to Central Java's largest urban centre. As a draft-status cable, BTI-2 has not yet entered service, meaning Semarang's role as an active submarine cable landing point is prospective at this stage.

Within the broader context of Indonesia's 70-cable, 139-landing-point network, Semarang represents one of many coastal nodes through which domestic submarine infrastructure reaches the Indonesian mainland's provincial centres. Its presence on the BTI-2 route underscores the role that intra-national cables play in connecting Java's north coast to the wider archipelago.