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  • Out of Its Comfort Zone:Indonesia and the South China Sea
  • Ristian Atriandi Supriyanto (bio)

During a visit to Tokyo in 2015, Indonesia’s president Joko Widodo publicly rejected China’s so-called nine-dash or U-shaped line claim in the South China Sea. Yet shortly thereafter in Beijing, he also agreed with Chinese president Xi Jinping that Indonesia’s “global maritime fulcrum” (poros maritim dunia) concept is complementary to China’s 21st Century Maritime Silk Road.1 Widodo’s statements give the impression that Indonesia is conveying a conflicting message to China, expressing concern about the U-shaped line while simultaneously trying to cultivate a closer economic relationship through maritime cooperation. This approach appears to reflect a hedging strategy that Indonesia and other Southeast Asian nations take in both accommodating and confronting China’s rise at the same time.2 In the long run, however, Indonesia could face a fork in the road where it will be unable to have closer cooperation with China while concurrently resisting intimidation and coercion whenever and wherever China attempts to impose the U-shaped line.

This essay examines Indonesia’s perspective as a non-claimant state on the South China Sea disputes. The first section discusses Indonesia’s interests in the South China Sea. The essay then considers the relevance of Indonesia’s status as a non-claimant state for its role in the disputes and assesses the implications of the South China Sea disputes for Indonesia’s relationships with China and the United States. Finally, the conclusion discusses the future that Indonesia envisages for the South China Sea. [End Page 21]

What Is at Stake?

The territorial disputes in the South China Sea place Indonesia’s interests at stake, namely the security of the resource-rich Natuna Islands, the sanctity of the United Nations Convention on the Law of the Sea (UNCLOS), the security of sea lines of communication, and nonalignment vis-à-vis the major powers. The security of the Natuna Islands is Indonesia’s immediate concern in the South China Sea. China has never claimed the islands, yet neither has it clarified to Indonesian policymakers the meaning of the U-shaped line. Indonesia rejects the U-shaped line and claims to have neither territorial nor boundary disputes with China.3 However, Indonesia is increasingly concerned with the potential spillover effects of conflict between China and other claimants as a result of Beijing’s assertive enforcement of the U-shaped line.

The Natuna Islands are scattered across over 100,000 square miles of ocean—more than ten times the size of their total land area—and only 27 out of the 154 islands are inhabited, with a total population of around 76,000 people.4 Despite the lack of infrastructure, the Natuna Islands are one of Indonesia’s richest regencies in offshore natural resources. Fisheries are estimated to yield a potential of 500,000 tons annually, but in reality the locals manage to haul in only a third of it through traditional methods. Chinese fishermen continually venture south into the fishing grounds around the islands, escorted by Chinese government fishery patrol vessels. A number of incidents have occurred between these vessels and Indonesian maritime authorities while the latter were trying to apprehend illegal Chinese fishermen, including one threatening encounter in which a Chinese government vessel trained its guns on an Indonesian patrol boat.5

Beneath the seabed also lie vast energy resources. Located within the purported overlap of the U-shaped line, the East Natuna block (block D-Alpha) is estimated to contain one of the world’s largest gas reserves at around 46 trillion cubic feet. Indonesia’s oil and gas company, Pertamina, in partnerships with U.S.-based ExxonMobil, France’s Total SA, [End Page 22] and Tailand’s PTT Public Company Limited, plans to begin production in 2024.6 Additionally, Pertamina holds some shares in the offshore blocks near Vietnam in the Nam Con Son Basin with PetroVietnam and Petronas that might overlap with the U-shaped line.

Chinese insistence on the U-shaped line also devalues Indonesia’s belief in the sanctity of UNCLOS. Jakarta has been consistently advocating for the convention, which recognizes Indonesia as an...


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