Mangalia, Romania

How the Internet Reaches Mangalia

Mangalia is a port city on the Black Sea coast in the south-east of Constanța County, Romania. Its position on the western shore of the Black Sea places it at one end of a regional submarine cable corridor connecting Romania to Bulgaria and Turkey. International internet traffic reaching Mangalia arrives via a single submarine cable — the KAFOS cable — which lands directly at this point, making Mangalia Romania's sole submarine cable landing point.

Because Romania's entire submarine cable infrastructure terminates here, Mangalia is not a secondary node along a larger corridor but the definitive entry point for undersea connectivity into the country. All international traffic traveling over submarine cable infrastructure into or out of Romania passes through this single landing point on the Black Sea.

The Cable Serving Mangalia

The KAFOS cable is a 538 km submarine cable that entered service in 1997. It connects Mangalia to Igneada, Turkey, Istanbul, Turkey, and Varna, Bulgaria, forming a regional triangle across the western Black Sea. Through its Turkish landing points — particularly Istanbul — the cable provides onward connectivity toward broader international networks. The Bulgarian landing at Varna adds a direct regional link to a neighbouring Black Sea nation. At 538 km, KAFOS is a relatively short cable by global standards, reflecting the contained geography of the western Black Sea basin.

Regional Context

Romania hosts just one submarine cable across a single landing point — Mangalia. This stands in contrast to many European nations that benefit from multiple cables landing at several coastal cities. Within the western Black Sea region, Mangalia sits alongside Varna (Bulgaria) and the Turkish landing points at Igneada and Istanbul as the cluster of cities served by the KAFOS cable. Of these, Istanbul in particular functions as a major regional hub connecting onward to broader international infrastructure.

What This Means for Connectivity

All of Romania's international submarine cable traffic flows through a single cable — KAFOS — at a single landing point in Mangalia. This means any disruption to the KAFOS cable directly affects the country's undersea cable connectivity. The destinations reachable via this infrastructure are Bulgaria and Turkey, with Istanbul serving as the gateway toward wider international networks beyond the Black Sea.

Romania's reliance on one cable at one landing point makes Mangalia an unusually concentrated node in national internet infrastructure terms. Understanding this helps explain how a small Black Sea port city carries outsized significance in the topology of Romania's international internet routing — and why the western Black Sea submarine cable network, though compact, plays a direct role in connecting Romania to the broader internet.