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Project of up to 575 km seeks to protect the northern coast of Java amid recurring floods, land subsidence, and discussions on cost, environmental impact, and protection of millions of residents.
Indonesia has advanced in planning a giant sea wall on the northern coast of Java, in a climate infrastructure project that could reach 575 kilometers and aims to protect coastal communities, industrial areas, agricultural zones, ports, airports, and the Jakarta region against floods, high tides, and land subsidence.
The project was included among the strategic priorities of President Prabowo Subianto’s government and, according to Reuters, has an estimated cost of up to US$ 80 billion.
The Coordinating Minister for Infrastructure and Regional Development, Agus Harimurti Yudhoyono, known as AHY, said the project should not be treated merely as a physical barrier against the sea.
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According to him, the proposal is also linked to the preservation of economically relevant areas for the country.
“This is not just a sea wall. It’s about protecting the future economy of our country and our people,” the minister stated in a statement released on May 19.
Northern coast of Java concentrates environmental and economic risks
The so-called Giant Sea Wall is expected to cross sections of the northern coast of Java, a region known as Pantura, where there are coastal communities, factories, agricultural areas, logistical infrastructure, and urban zones exposed to recurring floods.
The Indonesian government states that the construction seeks to reduce coastal risks associated with sea level rise, heavy rains, storm surges, and land subsidence.
The concern is not limited to Jakarta.
Authorities in the country state that the protection of the northern coast of Java involves areas of provinces such as Banten, West Java, Central Java, and East Java, in a strip with a strong population and industrial presence.
In 2025, Prabowo stated that the project aimed to protect about 50 million people, in addition to areas linked to a significant part of the national economic production.
The government also relates the project to food security.
The coastal plain of Java houses productive agricultural lands, and Indonesian authorities state that erosion, floods, and the gradual loss of coastal areas affect cultivation fields, transportation routes, and industrial regions.
According to official estimates cited by the Antara agency, the areas to be protected account for about US$ 368.3 billion of Indonesia’s Gross Domestic Product.
Maritime wall to be divided into 15 segments
The construction should not occur as a single front.
The North Coast of Java Management Authority, known by the acronym BOPPJ, reported that the approximately 575-kilometer route will be divided into 15 segments, with internal subdivisions to allow for phased studies and works.
The organization by sections, according to the agency, aims to adapt the project to the technical, social, and economic characteristics of each area.
Didit Herdiawan Ashaf, head of the authority responsible for managing the north coast of Java, stated that the development will be conducted in a “thematic” manner.
In the agency’s explanation, this means considering the existing economic activities along the coastline, so that the implementation of the infrastructure is aligned with local needs and mitigation measures.
The communities that live off the coast are among the groups directly affected by the planning.
The BOPPJ reported that the construction should take into account local livelihoods and economic activities present on the coast.
Civil society organizations heard by international media, on the other hand, state that projects of this magnitude can generate environmental and social impacts if there is no control over sand mining, mangroves, and fishing areas.
Project schedule has not yet been finalized by the government
Although the government has accelerated political articulation, the full execution schedule has not yet been publicly finalized.
The government reported that the implementation needs to integrate technical, environmental, and social criteria before the final definition of the stages.
The authorities also say that the 15 segments are still under evaluation for thematic and technical feasibility definition.
The planning stage includes studies on priority points, implementation alternatives, and coordination with local governments.
According to Antara, the segments range from Serang to Gresik, but the locations still depend on further evaluations.
This design indicates that the work should progress gradually, prioritizing more vulnerable areas and sections considered strategic.
The financial scale also requires external coordination.
In June 2025, Reuters reported that Prabowo invited foreign investors to participate in a project estimated at $80 billion to protect the northern coast of Java.
At that time, the proposal was described as an expansion of previous plans to protect Jakarta and could take up to 20 years to complete.
Land subsidence increases risk on the coast of Java
The pressure on the coast of Java gained new technical data with studies on subsidence, a term used to describe the gradual sinking of the ground.
Research released in April 2026 by the Columbia Climate School, based on a study published in the journal Science Advances, indicated that the lowering of the terrain surpasses ocean elevation along almost the entire northern coast of the island.
According to the researchers, large areas of Java are sinking at rates that can reach 1.5 meters per decade, especially in urban and coastal regions.
The study also indicates that, in some areas, subsidence may account for up to 85% of the relative sea level rise by 2050.
In the authors’ assessment, the risk perceived by communities depends on the combination of rising seas and sinking land.
Among the causes pointed out by the researchers are intensive groundwater extraction, agricultural and industrial water use, and natural compaction of sediments in delta regions.
In Jakarta, the World Bank had already warned that parts of the northern city suffer subsidence mainly associated with groundwater withdrawal, as well as drainage issues and infrastructure to handle heavy rains.
Government associates project with climate adaptation
AHY associated the acceleration of the sea wall with a broader climate adaptation agenda.
According to the minister, climate change is no longer just a future threat and is already imposing costs on the country.
He cited as an example Cyclone Senyar, which hit Sumatra in 2025 and was linked to large-scale floods and landslides.
Reuters reported that Cyclone Senyar hit parts of Southeast Asia after forming in the Strait of Malacca and left nearly 1,200 dead, including 969 on the Indonesian island of Sumatra.
Researchers from World Weather Attribution also analyzed the event and pointed to an increase in the intensity of extreme rainfall in the Strait of Malacca region in a warmer climate, although not all models allowed for a definitive quantification of the influence of climate change.
In this context, the Java wall is presented by the Indonesian government as part of a national response to the combination of extreme events, urban pressure, and coastal vulnerability.
“Adaptation is no longer a future scenario. Adaptation is a cost we must pay today,” stated AHY, while advocating for the advancement of infrastructure works aimed at climate resilience.
The execution of the project, however, depends on decisions regarding financing, engineering, environmental preservation, resettlements, and maintaining economic activities on the coast.
As the region combines land subsidence, frequent flooding, and high population concentration, the implementation of coastal protection remains linked to the advancement of the project’s technical, environmental, and financial stages.
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