Southeast Asia has long been sold as one story — a single region of 700 million people, tied together by the promise of Asean unity and a seat at the global table. The image is seductive: a dynamic, rising bloc sitting at the heart of the Indo-Pacific, bridging East and West, ocean and continent. It’s a narrative investors like to hear, diplomats like to repeat, and leaders like to project.
But reality refuses to cooperate with the brochure. Look closely, and you see not one Southeast Asia but two — one continental, one maritime. And this split is widening, with consequences not just for the region itself but for the global balance of power.
The splintering of Asean’s myth
Since its founding in 1967, Asean has preached the gospel of “centrality.” The association was meant to prevent external powers from dividing the region, offering a platform for consensus and neutrality. But geography and geopolitics have always cut deeper than summit communiqués.
In January 2025, Malaysia was shocked by a tragic case involving a Standard 2 student who lost her sight. The child’s vision loss was due to severe vitamin A deficiency, diagnosed after multiple medical tests. A medical examination revealed that it resulted from prolonged consumption of processed foods. This alarming and entirely preventable case in Malaysia underscores the broader issue of vitamin A deficiency, a significant public health challenge nationally and globally (TheSun 2025; MStar 2025; Fong 2025).
On one side are the continental states: Cambodia, Laos, Myanmar, Thailand and Vietnam — countries bound by rivers, roads and railways to China’s southwest. On the other are the maritime states: Indonesia, Malaysia, Singapore, the Philippines and Brunei — archipelagos and peninsulas whose fortunes are defined by sea lanes and global trade.
The Philippines sits awkwardly at the edge, militarily tied to Washington but struggling to find a place within Asean’s family. Brunei, tiny and oil-rich, keeps its head down. The rest of the region is quietly choosing sides, not through public declarations but through infrastructure, trade and defence alignments.
Beijing’s grip on the mainland
For most of history, the mountains and jungles of continental Southeast Asia served as a barrier. Chinese dynasties could influence the courts of Vietnam or Burma, but they could not fully dominate the region.
That calculus has changed. With the Belt and Road Initiative, Beijing has bulldozed through terrain that once protected Southeast Asian autonomy.
- In Laos, a US$6 billion (RM25.2 billion) high-speed rail line now links Vientiane directly to Kunming. Overnight, the landlocked country became more integrated with southern China than with its Asean peers. Trade has boomed, but at the cost of crippling debt and the emergence of semi-autonomous Chinese-run zones on Lao soil — spaces where scams, trafficking, and illicit economies thrive.
- In Myanmar, despite civil war, Chinese pipelines still pump oil and gas from the Bay of Bengal to Yunnan, securing Beijing a strategic energy corridor.
- In Vietnam, long wary of China, the story is more complicated. US tariffs on Chinese exports have pushed factories southward into Vietnam, especially in the north, binding Hanoi economically to Beijing even as it deepens security ties with Washington.
Continental Southeast Asia is being rewired into China’s hinterland. It may not be formal subjugation, but dependency is its own kind of leash.
Nusantaria: The oceanic counterweight
The maritime states tell a different story. Journalist Philip Bowring coined the term Nusantaria to capture the vast sea-bound world of Indonesia, Malaysia, Singapore and the Philippines — a region historically defined not by walls of land but by highways of water.
These states straddle the arteries of global commerce: the Strait of Malacca, the South China Sea, the Lombok Strait. Their strategic reality is stark: control these waters, and you control the flow of global trade. This geography has made them magnets for multiple powers — not just China, but also the United States, Japan, India and Australia.
Unlike Laos or Cambodia, these states can hedge. Singapore perfects the art of balancing, welcoming Chinese capital while anchoring US naval presence. Malaysia, true to form, plays a careful double game, hosting Belt and Road projects even as it resists Beijing’s encroachment into its exclusive economic zone. Indonesia courts everyone, while the Philippines leans harder toward the United States after years of bruising encounters with Chinese vessels in the South China Sea.
In maritime Southeast Asia, the competition is not about debt and dependency but about whose navy sails through the waves, whose companies secure the ports and whose investors finance the next great hub.
Malaysia at the crossroads
For Malaysia, this split is not an abstraction. It sits at the hinge of both worlds. To the north, the planned Pan-Asia Railway — linking Kunming to Singapore through Laos, Thailand and Malaysia — threatens to turn the peninsula into a continental extension of China’s supply chain. To the west and south, the Malacca Strait remains the chokepoint through which much of the world’s trade and energy pass, making Malaysia a maritime prize coveted by every major power.
This dual identity gives Malaysia leverage — but also risk. Lean too far toward China, and maritime autonomy could slip away. Depend too heavily on the US alliance system, and continental neighbours may drift further into Beijing’s embrace. Navigating this tightrope will define Malaysia’s economic and security posture for decades.
Why the divide matters
The split between continental and maritime Southeast Asia is more than a cartographic curiosity. It strikes at the heart of regional stability, economic opportunity and global order.
- Economic futures: Continental states risk becoming captive markets and resource suppliers for China. Maritime states, meanwhile, position themselves as multipolar hubs, open to India, Japan, Europe and the West. The two growth models may diverge sharply, with one tethered to a single patron and the other flourishing in pluralism.
- Security dilemmas: Maritime states face intimidation at sea, while continental states face creeping loss of sovereignty through infrastructure and debt. A common Asean defence posture becomes impossible when threats are so asymmetrical.
- Asean’s credibility: If the bloc cannot reconcile these divergent realities, “Asean centrality” will be exposed as little more than diplomatic theatre. Already, summits produce more platitudes than policies, while great powers deepen bilateral deals outside Asean’s framework.
The global stakes
The fracture in Southeast Asia matters far beyond the region. Continental Southeast Asia risks sliding into Beijing’s backyard, cementing China’s control of the Mekong and securing overland routes to the Indian Ocean. Maritime Southeast Asia, meanwhile, holds the keys to the South China Sea — waters that carry one-third of global trade.
For Washington and its allies, losing influence in maritime Southeast Asia would mean conceding the Indo-Pacific’s lifeline. For Beijing, securing the continental states while neutralising resistance at sea would mark the fulfilment of its long-held dream of regional primacy.
This is why the US, Japan, India, and Australia are doubling down on defence ties with the Philippines, Singapore, and Indonesia — even as Beijing quietly cements its grip on Laos and Cambodia. The contest is not abstract. It is unfolding now, in rail lines and naval drills, in trade agreements and fishing skirmishes.
The path ahead
What can be done to prevent Southeast Asia from splintering beyond repair?
- For Asean: it must confront the uncomfortable truth that consensus politics is no longer enough. Hard questions about sovereignty, debt, and maritime rights must be addressed head-on, or unity will remain a hollow slogan.
- For Malaysia and its neighbours: the choice is not between China or the United States, but between dependency and diversification. The region’s strength has always been its openness. Preserving that requires resisting the gravitational pull of any single power.
- For the global community: Southeast Asia is not just a regional story. It is the world’s supply chain hub, its trade corridor, and its frontline in the contest between spheres of influence and open seas. Ignoring its fracture is a mistake no economy can afford.
Conclusion: One region, two futures
Southeast Asia stands at a fractured crossroads. One path leads inland, toward dependency and absorption into Beijing’s sphere. The other stretches seaward, toward openness and contested but multipolar engagement.
The region cannot walk both paths forever. For Asean, for Malaysia, and for the world, the choice of direction will shape not just regional fortunes but the very architecture of the Indo-Pacific.
The myth of one Southeast Asia is over. The question now is which Southeast Asia will define the future.
Abbi Kanthasamy (www.abbiphotography.com) is a Canadian entrepreneur, photographer, and writer.
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