How Loja Became a Model for Nature-Based Urban Design

Loja, a city in southern Ecuador, is widely known as the country’s cultural capital, particularly for its vibrant music scene. With a population of around 200,000, it has faced many of the same challenges as other cities.

However, the steps it has taken to integrate nature—through parks, trees, and vegetation—have transformed the city and demonstrated how nature-based solutions can improve residents’ quality of life, strengthen resilience, and foster a sense of pride.

The city is surrounded by rivers, forests, and parks. Yet these natural areas were once degraded, with river pollution, hillside erosion, and a constant risk of flooding. Less than a decade ago, Loja began restoring these environments, leveraging its natural assets to benefit residents.

A report by the World Resources Institute (WRI) highlights Loja’s green transformation, which took place in under ten years.

A key turning point came in 2017, when the city partnered with the German Agency for International Cooperation and researchers from the Universidad Técnica Particular de Loja.

This collaboration reimagined the city as an interconnected ecological and social system shaped by its rivers, hills, and ravines.

The Sistema Verde Urbano: A holistic urban approach

The partnership led to the development of the Sistema Verde Urbano (Urban Green System), which integrates nature-based solutions into urban planning.

This system effectively manages stormwater and wastewater, mitigates flood risks, improves water quality, restores ecosystems, and creates habitats for local wildlife.

Additionally, it helps regulate urban temperatures and provides green spaces that serve as recreational areas, enhancing residents’ well-being.

A key feature of the system is the development of green corridors—shaded, interconnected pathways linking previously isolated parks, rivers, and ravines into a cohesive network. City workers maintain these areas daily, caring for more than 600 hectares (1,482 acres) of green space woven throughout this Andean city.

These corridors deliver multiple benefits. They regulate temperatures, absorb stormwater, and provide safe, accessible spaces for the community.

Residents report improved well-being: children now have safer routes to playgrounds, people walk and cycle more frequently, older residents use shaded areas for exercise and social interaction, and hikers navigate the city through these green pathways.

Water management and community-led resilience

Loja has integrated its rivers into a comprehensive water management strategy. The Sistema Verde Urbano aligns with the natural flow of the Zamora and Malacatos rivers, which are central to the city and connect to approximately 40 streams within the larger Andean watershed.

This approach has effectively reduced flood risks and pollution while creating healthier, safer environments for residents.

The city’s wastewater treatment plant uses a biological percolation system, returning treated water to the rivers. Meanwhile, sludge is repurposed to regenerate soils in hillside reforestation areas. The facility has since become a training hub, inspiring other cities to adopt similar practices.

Loja continues to expand pedestrian and cycling infrastructure, shifting away from car-centric planning towards people-focused mobility. Efforts are also underway to make public transport more accessible, particularly for vulnerable groups.

Community engagement has been key to this transformation. Teachers, students, university researchers, and local technical groups actively participate in maintaining and protecting the city’s green spaces.

As a result, Loja has become a model for other Andean cities, including Cuenca, Riobamba, and Ambato, which are now studying its approach.

A 2020 study titled “Sistema Verde Urbano de Loja como base estructurante de la ciudad” supports this model, suggesting that green infrastructure should serve as the foundational framework for urban development.

By organising the city around natural and semi-natural systems, Loja shows how sustainable development can enhance biodiversity, improve quality of life, and strengthen the connections between urban and rural environments.