Nestled within the coastal sand dunes of Bãi Dài, Cam Ranh, Vietnam, Hidden Spa - Water Hope is a spa and mud bath complex designed by IDEE Architects as an extension of the landscape rather than an object placed upon it. Instead of imposing a new form onto the site, the project embraces the natural topography, allowing the architecture to disappear beneath the dunes while creating a calm environment dedicated to wellness and contemplation.

The site presented an extreme natural environment. Strong coastal winds, intense tropical sunlight, and barren sand dunes offered little shade or vegetation. Rather than resisting these conditions, the architects sought to transform them by introducing water, planting and carefully controlled microclimates.

At the heart of the project is a central water courtyard that serves as both the spatial and environmental core of the spa. Reflecting pools, planted islands and shaded walkways create a sequence of spaces where temperature, humidity and light gradually shift as visitors move through the complex. Water is not treated as a decorative element but as environmental infrastructure, cooling the surrounding spaces while enhancing the sensory experience.

The building is organized as a continuous, curved structure that embraces the courtyard. Its roof follows the existing sand dunes, allowing visitors to walk across a planted landscape while minimizing the architecture's visual impact. By adapting to the natural terrain rather than flattening it, excavation was significantly reduced, preserving the relationship between architecture and landscape.

Material selection was guided by durability, locality and environmental performance. Locally sourced stone, timber and bamboo form a restrained architectural palette that responds naturally to the tropical climate. Thick stone walls provide thermal mass, while open corridors and bamboo ceilings promote natural ventilation. A vegetated roof further reduces heat gain, while rainwater collected from the sloping roof is reused for landscape irrigation.

One mature tree standing on the dune before construction became a symbolic anchor for the entire project. Rather than removing it, the design evolved around its presence. Over time, the introduction of water, shade, and vegetation has gradually transformed the once-barren landscape into a small oasis where architecture and nature continue to grow together.

Hidden Spa – Water Hope reflects IDEE Architects' broader design philosophy: architecture should emerge from its context rather than dominate it. Instead of relying on iconic form, the project focuses on atmosphere, climate and human experience. It demonstrates how architecture can regenerate a fragile landscape while creating meaningful spaces for rest, healing and connection with nature.

Recently awarded the Architizer A+Awards 2026 Jury Winner in the Spa & Wellness category, Hidden Spa - Water Hope represents a contemporary interpretation of tropical architecture, where sustainability is achieved not through technological complexity but through a thoughtful dialogue among landscape, climate, and architecture.