Muro das Nove Janelas, or the Wall of Nine Windows, is a significant historical and architectural landmark located on São Miguel Island in the Azores. This structure was constructed as part of the aqueduct system that supplied water to the city of Ponta Delgada. Built between the 17th and 18th centuries, the aqueduct was designed to address the water shortages faced by the city, transporting water from the nearby Lagoa do Canário and Lagoa das Empadadas  .

The wall is characterized by its nine arched windows, which give it its name. Built primarily from local lava stone, the Muro das Nove Janelas not only adds to its durability but also allows it to blend seamlessly with the island’s natural landscape. The arched design is not only functional but also aesthetically pleasing, making it a popular spot for photographs and visits  .

Today, Muro das Nove Janelas stands as a testament to the engineering skills of its builders and is a popular tourist attraction. Although it is no longer in use, it is preserved as an important part of São Miguel’s heritage  . Restoration efforts have focused on maintaining its historical integrity, ensuring that future generations can appreciate its beauty and significance .

Visitors to the wall can enjoy scenic views and take in the unique architecture that reflects the rich history of the Azores. The combination of natural beauty and historical significance makes Muro das Nove Janelas a must-visit location for anyone exploring São Miguel Island.