The Fight Against a Sinking City: Jakarta’s Sea Wall

Julia Kelley

While Indonesia’s government seeks to build a large sea wall to protect Jakarta from detrimental floods, criticism in the name of environmental and economic loss urges them to look for other solutions.

Flooding Ciliwung River in Jakarta Region

Flooding Ciliwung River in Jakarta Region. World Meteorological Organization. CC BY-NC-ND 2.0.

On the northwest coast of Indonesia stands Jakarta, the country’s capital and largest city. Sitting upon a low, flat alluvial plain with swampy areas, Jakarta is notably susceptible to major floods every few years from its multiple rivers and the adjoining Java Sea. This is made worse by excessive groundwater extraction and rising global sea levels, which have seen a worldwide mean increase of about eight to nine inches since 1880 due to global warming. Rapid urbanization, population growth and a change in land use have crowded more and more people into high-risk floodplain areas, leaving thousands displaced and large parts of the city submerged underwater during these natural disaster events. Although the Indonesian government built a coastal wall in 2002 to combat this, its collapse in a storm only five years later renewed the call for protective measures against destructive flooding. A new mega-project began in 2014, outlining both the construction of a new 29-mile-long sea wall and the so-called “Giant Sea Wall.” This “Giant Sea Wall,” a 20-mile-long artificial island shaped like a Garuda bird, Indonesia’s national symbol, will not only block storm surges but is also planned to contain homes, offices and recreational facilities. 

This massive undertaking officially kicked off in February 2025 and is said by supporters to be key in dealing with the country’s land subsidence and flooding. Both President Prabowo Subianto and Minister of Infrastructure and Regional Development Agus Harimurti Yudhoyono claim that the project could save the government billions of dollars in disaster mitigation over the following 30 years. Despite this optimism, critics have come out against the large project, citing an array of detrimental economic and environmental issues that could result from construction. For example, many have noted how the proposed solution does not address the over-extraction of groundwater, which comes from excessive use by industrial and economic activities. In addition, the sea wall could disrupt marine biodiversity and, subsequently, the fishing industry, one of Indonesia’s strongest monetary sources. According to Maleh Dadi Segoro, a coalition of environmental and social groups, the sea wall would potentially narrow and close fishing catch areas, disrupting marine ecosystems and threatening the livelihoods of those who depend on them for food and income. Jakarta already faces low water quality in its rivers and canals, causing sewage and a lack of proper sanitation. Closing off Jakarta Bay for this sea wall, critics say, would turn the water into a “septic tank” or “black lagoon,” which necessitates a stronger water sanitation system immediately. 

Controversy stirred up by the sea wall proposal has thus solicited alternative solutions. There has been an interest in using the water to its advantage, rather than working against it. This would entail diverting surplus waters, including that from floods, to surrounding farm areas where it could be stored. Restoration has also been widely proposed, as described by professor of oceanography Alan Koropitan for The Guardian: “If, instead, we can restore the bay and its polluted waters, that would mean something good for civilization in Indonesia.” Among all these suggested plans, environmental, social and economic protection are set at the center, urging the Indonesian government to rethink its monumental and costly plan. 

GET INVOLVED:

Those looking to help support those affected by floods and flood prevention in Indonesia can do so by checking out relief organizations, such as The International Federation of Red Cross and Red Crescent Societies’ Disaster Response Emergency Fund, Peace Winds and Mercy Corps, all of which provide immediate and long-term support. Furthermore, individuals interested in combating sea level rise can look into taking actions that counter global warming, including using renewable energy, reducing greenhouse gas usage, considering electric vehicles, recycling, decreasing food waste, keeping the environment clean, or getting involved with local communities and government to organize plans and legislation. 


Julia Kelley

Julia is a recent graduate from UC San Diego majoring in Sociocultural Anthropology with a minor in Art History. She is passionate about cultural studies and social justice, and one day hopes to obtain a postgraduate degree expanding on these subjects. In her free time, she enjoys reading, traveling, and spending time with her friends and family.

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Indonesia's Most Dangerous Job: Mining in an Active Volcano

The mesmerizing sulfur-induced blue flames of Indonesia’s Mount Ijen attract hundreds of tourists every night, but mask one of the most dangerous jobs in the world: sulfur mining.

Sulfur miners of Mount Ijen. Candra Firmansyah. CC BY-SA 4.0. 

Sulphur-induced blue flames are nothing more than a mining by-product, but they have turned Indonesia’s Mount Ijen into a popular tourist attraction. Lured in by the magical phenomenon, I joined a tour group and hiked up the volcano in the hopes of getting a glimpse of the beautiful fire. But the shocking truth of what I discovered was far from magical. Sulfur miners were working in the crater. Slaving away among the fire and smoke, they wore no special clothing nor eye protection. Some did not even have gas masks. Watching the men was heart-rending, and made the blue flames seem completely insignificant. The reality of Mount Ijen is that sulfur miners work everyday in the most unforgiving environment in the world.

Blue flames at Mount Ijen. Thomas Fuhrmann. CC BY-SA 4.0.

Mount Ijen, in Indonesia, is an active volcano situated on East Java, the closest island to the holiday-maker hotspot of Bali. Possessing unique characteristics, the views at Mount Ijen are otherworldly. The volcanic crater holds the largest highly acidic lake in the world, which beams with a vibrant, almost inviting turquoise blue. Above the lake are vivid yellow rocks that have been stained as a result of sulfur gasses condensing.

Mount Ijen. Taylor Girhiny. Used with the author’s permission.

While spectacular to see, many dangers lurk in the volcano. Aside from the unpredictable volcanic eruptions, earthquakes are common and have been known to cause landslides in the crater. There was even an earthquake in 2020 that triggered a seiche-type tsunami in the acid lake. The seismic activity caused the mountain to belch poison gas and generated a three-meter wave that swept across the crater,, killing a sulfur miner.

Despite these dangers, the sulfur has drawn miners to the volcano since 1968 and has become a trade passed down through families ever since. Known locally as the ‘devil’s gold’, it is considered a commodity worth high risk. Not only do miners risk a quick death while mining, but they also experience long-term health issues and have an average life expectancy of just 50 years old.

In the dead of night, when the air is at its coolest, sulfur extraction commences. Miners start by hiking the 2000 feet incline, the equivalent of two eiffel towers, before descending into the crater. At this point, the sulfuric smell of rotten egg takes over, making it hard to breathe. Pipes that travel below the surface provide access to the sulfur. The miners use fire to heat the ground, causing the sulfur to liquidize and trickle through the pipework onto the ground outside. Left to cool and dry, the ‘devil’s gold’ takes shape in the form of rich, yellow crystalized rocks.

Melted sulfur crystallizing. Taylor Girhiny. Used with the author’s permission.

During the heating process, large clouds of harmful gas burst out from beneath the arid, rocky terrain. Each thick, opaque cloud swallows everything in its path, causing a complete whiteout. Unable to see even one meter in front of them, miners are left sightless until the miasma disperse. The atmosphere was so harsh that my throat tightened up and I was coughing after just 10 minutes in the crater. Daily exposure to these toxic fumes leaves miners with life-long respiratory issues. One miner, Udi, explained to me that his own father became blind due to repeated exposure to the fumes and, despite seeing the suffering in his family, has no choice but to follow the same line of work. 

Handmade carrier full of mined sulfur. Eva Adorisio.

Once the sulfur has been processed, it must be carried out of the volcanic crater. A steep path consisting of unsteady rocks is the only way out and, with no technology to aid in their efforts, miners must physically transport every piece of the precious material. They precariously balance up to 170 pounds of sulfur, more than their bodyweight, on their handmade shoulder carriers. Without proper back support, miners suffer back problems and often swelling in the shoulders.

Sulfur produced at Mount Ijen is sold on and used in a variety of products including detergents and cosmetics, and is even used to whiten sugar. According to Udi, one kilogram of sulfur is sold for 1000 Indonesian Rupiah ($0.065). If a miner sells a full load of sulfur that may have taken all night to produce, he will make 75,000 Rupiah (approximately $5). Surprisingly, this makes sulfur mining one of the better paid jobs in this remote area of Java. With high poverty rates, it is clear why locals risk their lives to sustain a livelihood.

Miner selling miniature baskets of sulfur as souvenirs for tourists. Eva Adorisio.

The shocking reality is that local men are putting their lives on the line for what most in the West would consider pocket money. Witnessing them work tirelessly in the most inhumane conditions is an inconceivable sight, yet has become a spectacle for tourists to gawk at. The promise of stunning blue flames may sound alluring, but in truth Mount Ijen is a merciless place that no one should have to call work.

In 2017, Ijen Assistance raised $15,000 for relief work in the region from a music video following Bas, a sulfur miner, and his family. 

Novo Amor & Lowswimmer - Terraform (official video)

TO GET INVOLVED

Providing aid after natural disasters, Islamic Relief has been working in Indonesia since 2000. After the earthquakes of 2006 and 2009, the organization responded immediately, distributing emergency supplies and later rebuilding a hospital and school. They also work to reduce the effects of poverty and have a variety of development projects across Indonesia.

Currently, there are no organizations working directly to improve the conditions for sulfur miners at Mount Ijen. Despite previous campaigns raising awareness and money, such as the ‘Terraform’ music video, miners continue to work in the same harsh conditions.


Eva Adorisio

Eva is an avid traveler and writer from Bristol, England. In her writing, she aims to show the true nature of what a place is really like. Her Italian roots have led to a love of food, culture and language. She also spends her time staying active out in nature and is always searching for the next adventure.