Indonesia intends to construct a sea wall exceeding 500 kilometers to protect Java’s northern shore from rising sea levels. The plan features a large lagoon behind the structure and carries an estimated cost of at least 80 billion US dollars, with construction possibly beginning in 2026. Civil society organizations warn that the project may increase sand extraction, harm mangrove forests, and disrupt fishing communities while worsening prior environmental damage from industrial activity. Indonesia already experiences frequent severe flooding linked to climate change. Past infrastructure responses such as canals and river modifications have often proved temporary or counterproductive as land continues to subside. Observers advocate instead for community consultation, improved wastewater systems, and river restoration. Funding may involve national and provincial budgets plus partnerships with nations including the United Arab Emirates, raising questions about long-term upkeep expenses. Research indicates that subsidence stems largely from groundwater extraction, mangrove loss, and building weight. Local studies show that partial defenses like raised roads and smaller walls can shift flood risks to neighboring areas and fail to address root causes. For neighboring Australia, outcomes of the project could influence regional stability and food security.
