La Union, Philippines

Position in regional infrastructure

La Union is a coastal province in the Ilocos Region on the island of Luzon in the northern Philippines, with cable landing facilities near the provincial capital city of San Fernando, at coordinates 16.582591°N, 120.389637°E. The province sits on the western coast of Luzon facing the South China Sea - a geographically ideal position for cables routing between Southeast Asia and the trans-Pacific cable network reaching North America. Two cables land at La Union: the historic Asia-America Gateway and the upcoming SEA-H2X system planned for 2026.

La Union's role in Philippine cable infrastructure complements the larger southern landings near Manila. As a northern-Luzon landing, it provides geographic and political diversity - a fault affecting Manila-area landings does not necessarily affect La Union, and vice versa. For trans-Pacific traffic, the western-coast position avoids cables having to first transit eastward across the Philippines before turning north toward Japan or east toward the United States.

Submarine cables landing in La Union

Asia-America Gateway (AAG) Cable System is a 20,000 km submarine cable system in service since 2009, owned by an 18-member consortium including AT&T, BT, PLDT, Telstra, Telekom Malaysia, Singtel partner StarHub, and others. From La Union, AAG reaches Brunei, Hong Kong (Lantau Island China), Guam, Malaysia (Mersing), Singapore (Changi North), Thailand (Sriracha), Vietnam (Vung Tau), and the United States (Hawaii Keawaula and California Morro Bay). AAG was a major late-2000s trans-Pacific system providing one of the principal direct routes between Southeast Asia and the US West Coast.

SEA-H2X is a planned 6,000 km submarine cable system scheduled for ready-for-service in 2026, owned by China Mobile, China Unicom, and Converge ICT. From La Union it will connect to Lingshui and Tseung Kwan O in China, Kuching in Malaysia, Tuas in Singapore, and Songkhla in Thailand. SEA-H2X represents Chinese-operator-led capacity addition into the Southeast Asia mesh, with the La Union landing giving the Philippines a stake in modern China-Southeast-Asia cable infrastructure.

Connection topology and redundancy

The two La Union cables reach overlapping but not identical destinations. AAG provides trans-Pacific connectivity to Hawaii, US mainland, and Australia (via Spark New Zealand consortium membership). SEA-H2X is regional Southeast Asia-China only, without trans-Pacific reach. This asymmetry means a fault on AAG severely affects La Union's US-bound traffic, while a fault on SEA-H2X affects regional Southeast Asia traffic - different failure scopes.

The two cables share Singapore as a destination (Changi North via AAG, Tuas via SEA-H2X) but use different singapore landings - providing some Singapore-end diversity. Owner concentration is significant for the planned SEA-H2X (only three operators, two of them Chinese state-aligned), in contrast to the broad consortium ownership of AAG. For traffic requiring strict operator diversity, the AAG path remains the preferred option.

Geography and coordinates

The La Union submarine cable landing sits at 16.582591°N, 120.389637°E (16°34'57"N, 120°23'23"E), on the western coast of Luzon island in the northern Philippines. The province faces the South China Sea, providing direct cable approach corridors westward without intervening Philippine archipelago shadowing. Landing infrastructure is in the vicinity of San Fernando, the regional capital.

Frequently asked questions

What submarine cables land at La Union, Philippines?

Two cables land at La Union: Asia-America Gateway AAG (RFS 2009, 20,000 km, multi-operator consortium) and SEA-H2X (planned RFS 2026, 6,000 km, China Mobile + China Unicom + Converge ICT).

What are the coordinates of the La Union cable landing?

The La Union cable landing is at 16.582591°N, 120.389637°E (16°34'57"N, 120°23'23"E), on the western coast of Luzon facing the South China Sea.

Which countries connect to the Philippines through La Union?

Through AAG, La Union reaches Brunei, China (Hong Kong), Guam, Malaysia, Singapore, Thailand, Vietnam, and the United States (Hawaii and California). Through SEA-H2X (planned 2026), La Union will additionally reach mainland China (Hainan and Hong Kong), Malaysia (Sarawak), and Thailand (Songkhla).

When was the first submarine cable laid at La Union?

The earliest documented La Union landing in the GeoCables dataset is AAG, in service since 2009. SEA-H2X is scheduled for 2026.

Who operates the cables landing at La Union?

AAG is operated by an 18-member consortium including AT&T, BT, PLDT (Philippines), Telstra, Singtel partner StarHub, Telekom Malaysia, and others. SEA-H2X will be operated by China Mobile, China Unicom, and Converge ICT.