Koh Samui, Thailand

Koh Samui, Thailand: Submarine Cable Landing Point

Koh Samui is an island located off the east coast of Thailand, part of Surat Thani Province and the second largest island in the country. As an island destination, submarine cable connectivity forms an essential part of its telecommunications infrastructure, linking it to the broader Thai mainland network. One submarine cable lands at Koh Samui, connecting the island domestically within Thailand.

The single cable serving Koh Samui is the Thailand Domestic Submarine Cable Network (TDSCN), which — as its name indicates — operates entirely within Thai waters. This makes Koh Samui a node on a domestic inter-island corridor rather than an international gateway, positioning it as a landing point oriented toward internal national connectivity.

Cables Landing at Koh Samui

The Thailand Domestic Submarine Cable Network (TDSCN) is the sole submarine cable landing at Koh Samui. Spanning 884 kilometres, it reached ready-for-service (RFS) status in 2001, with its current status noted as draft. All endpoints of the TDSCN are located within Thailand, making it a purely domestic cable system designed to provide submarine-routed connectivity between points along and around the Thai coast and its offshore islands.

Regional Context

Within Thailand's submarine cable landscape, Koh Samui sits among seven landing points that collectively host 16 cables. The island ranks in the mid-tier of these landing points by cable count, hosting one cable alongside similarly positioned peers such as Chumphon, Phetchaburi, and Rayong, each of which also hosts a single cable. By contrast, Songkhla and Satun — with nine and seven cables respectively — serve as far more densely connected landing hubs within the country.

Network Role

Koh Samui functions as a single-cable terminus within Thailand's submarine cable network. Its connection via the TDSCN is domestic in scope, linking the island to other Thai landing points through a system specifically built to serve intra-national connectivity needs. The cable's 884-kilometre length reflects the distances involved in stitching together Thailand's coastal and island communities through underwater infrastructure.

As a terminus for one domestic cable rather than a multi-cable hub, Koh Samui occupies a more modest position in the regional submarine cable graph compared to major Thai landing points. Nevertheless, its inclusion in the TDSCN network illustrates how island geography in Southeast Asia drives the need for submarine solutions even at a purely domestic scale, where overland or aerial routes are not available.