Chennai, India

Chennai, on the eastern coast of India in Tamil Nadu state, is one of the country's two principal submarine cable landing hubs alongside Mumbai on the western coast. The Chennai landings serve as the eastern entry and exit point for international internet traffic to and from southern and eastern India — covering Bangalore's enormous IT-services concentration, Hyderabad's data-centre cluster, and the Tamil Nadu industrial belt — and they have been a structural part of India's outbound capacity since the early 2000s.

Among the cables landing at Chennai, the most prominent in our monitoring set is SEA-ME-WE-4, a 20,000-km Asia-Europe consortium trunk in service since 2005 that connects Chennai to Colombo, Karachi, Fujairah, the Egyptian Red Sea coast at Zafarana and Suez, and onward through the Mediterranean to Marseille. SEA-ME-WE-4 is among the workhorse cables of Indian outbound capacity to Europe, alongside SEA-ME-WE-3, SEA-ME-WE-5, IMEWE, EIG, and several others — each a consortium-owned long-haul system that includes Tata Communications, Bharti Airtel, or other Indian carriers among its sixteen-or-so owners.

The Chennai landings differ from Mumbai in routing role: Mumbai-side cables tend to dominate westbound traffic toward the Persian Gulf and the Mediterranean, while Chennai-side cables historically focus more on eastbound capacity into Southeast Asia and the Pacific. The actual division of traffic depends on which Indian carrier originates the flow and which BGP route preferences they have configured, but for many South Asian destinations — Sri Lanka, Bangladesh, Myanmar — Chennai is the closer logical peering point and the natural cable terminus.

India's overall submarine cable footprint has been expanding rapidly through the 2020s, with newer systems including 2Africa-Pearls and project-stage cables landing or planning to land at Chennai. The city's role as one of India's two flagship submarine cable hubs is therefore not static: it is one of the small set of Indian coastal cities that determines how India connects to the rest of the world's internet infrastructure, and the volume of capacity passing through these landings has been growing along with India's own internet traffic and cloud-region presence.