Monaco, synonymous with luxury living and financial exclusivity, has expanded its territory by 3% with the completion of the €2 billion ($2.1 billion) Mareterra project. Built directly into the Mediterranean Sea, this “eco-district” adds nearly 15 acres of new land, marking a major shift toward sustainable urban development.

A New Model for Land Reclamation

Inaugurated by Prince Albert II, Mareterra addresses Monaco’s chronic space constraints. The city-state, home to 39,000 residents within just 2.1 square kilometres, has a history of land reclamation dating back to the 1960s. However, unlike past projects, Mareterra prioritises sustainability and environmental preservation.

Work on Mareterra began in 2013, using concrete caissons — large, hollow chambers submerged in the sea, drained, and filled with 750,000 metric tons of sand. This method, combined with a strong ecological focus, created a district with luxury residences, a marina, a promenade, and public green spaces. Around 50% of the new land is accessible to the public, featuring parks, cycling paths, and retail areas. Over 1,000 trees, imported from Tuscany, have been planted to support biodiversity.

Sustainability at the Core

Unlike traditional land reclamation, which often disrupts marine life, Mareterra incorporates several eco-friendly measures. Developers collaborated with marine biologists to protect biodiversity, creating artificial seagrass beds to support marine habitats. The district also prioritises clean energy, with 80% of its heating and cooling needs met by renewable sources, including 1.2 acres of solar panels.

This approach aligns with Monaco’s broader commitment to sustainable development, championed by Prince Albert II, a known advocate for ocean conservation. His influence was instrumental in halting a 2009 reclamation proposal due to environmental concerns, prompting tighter regulations for future projects.

A New Standard of Luxury

Mareterra isn’t just an eco-friendly initiative — it’s also a prime real estate development. The project features over 100 upscale apartments and 10 exclusive villas designed by world-renowned architects, including Norman Foster, Tadao Ando, and Renzo Piano. Piano’s contribution, “Le Renzo,” offers luxury living with his signature architectural style.

Although official property prices have not been disclosed, estimates from Knight Frank suggest homes in the district could sell for around €100,000 per square metre — nearly double Monaco’s average real estate price. As Monaco’s land becomes increasingly scarce, demand for properties in Mareterra is expected to soar.

Revenue Boost for Monaco

Privately funded, Mareterra is still a financial win for Monaco. The government will collect a 20% tax on property sales, providing a steady source of revenue. Expanding the Grimaldi Forum, Monaco’s conference centre, was also part of the project, boosting the state’s capacity to host large-scale events. With reclaimed land making up over 25% of Monaco’s total territory, the principality has established a model for sustainable growth and financial resilience.

Monaco vs. Dubai: A Tale of Two Visions for Coastal Expansion

When comparing Monaco’s approach to land reclamation with Dubai’s, the two cities take markedly different routes.

Monaco focuses on sustainable urbanization with a commitment to preserving marine biodiversity and minimizing environmental impact. The Mareterra project exemplifies this ethos, utilizing green building methods and renewable energy sources. Monaco aims to enhance the quality of life while maintaining ecological harmony, ensuring that the expansion benefits both its residents and the surrounding ecosystem.

In contrast, Dubai has prioritized large-scale luxury developments, building iconic “glamorous islands” like The Palm Jumeirah and The World Islands. While these projects have spurred economic growth and attracted elite investors, they have faced significant ecological issues. The traditional method of land reclamation, primarily through sand dredging, has led to the destruction of coral reefs and the disruption of local marine ecosystems. Additionally, issues like soil subsidence and altered ocean currents threaten the long-term stability of these artificial islands.

Dubai’s focus has been on tourism and real estate investments, with projects designed to generate substantial revenue. These developments are often criticized for their environmental costs, including the strain on local ecosystems. On the other hand, Monaco aims for a balanced approach, focusing on creating a functional and ecologically sustainable environment.

Monaco’s Mareterra sets a new benchmark for sustainable land expansion. By increasing the principality’s size by 3%, it offers a practical solution to space constraints while promoting eco-friendly development. This approach stands in stark contrast to Dubai’s high-profile island ventures, which focus on luxury tourism and private investment. While Dubai’s grand projects capture global attention, Monaco’s quieter, sustainability-driven model may well shape the future of urban development.