One of Rio de Janeiro’s most iconic natural landmarks, Sugarloaf Mountain, has been the center of a years-long environmental and legal battle that took a dramatic new turn this week, when a Brazilian judge ruled to block a controversial zipline construction project on the UNESCO World Heritage Site.
The proposed adventure attraction planned four parallel ziplines stretching 755 meters between the 396-meter peak of Sugarloaf Mountain and nearby Morro da Urca, running alongside the historic cable car route that has connected the two landforms since 1912. Developers marketed the project as a high-thrill tourist addition, promising visitors speeds of up to 100 kilometers per hour on the downhill descent.
First launched four years ago, the initiative sparked immediate and sustained pushback from local communities and environmental activists across Brazil. Opponents argued that the construction of zipline access platforms required extensive rock excavation at the mountain’s peak, causing permanent, irreversible damage to the sensitive protected ecosystem and geological landscape of the heritage site. In response, the site management company and project developers claimed excavation would be limited to existing developed areas to minimize disruption, and had already secured formal approval from both the Rio de Janeiro City Council and Brazil’s National Historical and Artistic Heritage Institute (IPHAN).
The project faced repeated construction halts through years of legal challenges, and was 95% complete when Brazil’s high court ruled in January 2026 to allow work to restart, arguing that halting construction at that late stage would cause more environmental harm than finishing the project. That ruling has now been fully overturned by this week’s court decision.
In his ruling, the judge emphasized that Sugarloaf Mountain holds inestimable cultural and natural value not only for Brazilians, but for people across the globe. As part of the ruling, both IPHAN and the project developer were ordered to pay 30 million Brazilian reals (approximately $5.77 million USD) in environmental damages for harm already caused during construction.
Activist leaders who spearheaded the campaign against the zipline called the ruling a landmark victory for environmental protection of Brazil’s natural heritage. Gricel Osorio Hor-Meyll, one of the lead organizers of the opposition campaign, confirmed the outcome to AFP, describing the decision as a huge win for conservation.
Despite the court’s ruling, the legal fight over the project is far from over. Developers have announced they plan to appeal the decision, leaving the future of the nearly completed attraction uncertain while the case moves through Brazil’s appellate courts.