The Rua da Marinha, a significant infrastructure project aimed at enhancing transportation in Belém for the COP 30 conference, was officially inaugurated on Thursday, five months following the event that took place in November 2025. The project, which cost 253 million reais and was executed in partnership with the Pará government and BNDES, was designed to improve access and connectivity in the region. It runs around the Gunnar Vingren Municipal Ecological Park and had faced numerous environmental controversies before receiving legal approval based on environmental licenses.

Spanning nearly 3.4 kilometers, this new street is expected to significantly benefit over 200,000 residents by linking the Augusto Montenegro and Centenário avenues in the Marambaia neighborhood. Prior to its completion, only parts of the road were open for traffic, limiting the expected benefits to the community. The road includes two lanes for each direction, a central strip with around 260 newly planted trees, playground areas, an outdoor gym, and a bike lane, all contributing to the area's infrastructure improvement while also attempting to address community needs for green spaces amidst urban development.

The project’s delayed completion and the controversies surrounding its environmental impact raise questions about the balance between urban development and ecological preservation in Brazil. As the country continues to prepare for more international events, these issues exemplify the complexities and challenges involved in managing large infrastructure projects in ecologically sensitive areas. Ensuring that future developments consider environmental sustainability will be crucial for maintaining public support and protecting natural resources.