1 floor sunken courtyard illustration

Quick answer：

A sunken courtyard, also known as a sunken garden, is a type of courtyard design where the garden is located below the level of the surrounding building. It is often used in architectural plans to create a more private and secluded outdoor space. The illustration would depict this design feature with dimensions, plantings, and structural elements such as walls or steps. This design can enhance privacy, provide a serene atmosphere, and offer a visually appealing transition between indoor and outdoor living spaces.