A first-level sunken courtyard design drawing is a visual representation of a sunken garden or courtyard that is situated at the lowest level of a building. This type of design is often found in residential or commercial architecture and is characterized by its lower elevation compared to the surrounding area. The design typically includes landscaping elements such as plants, trees, and water features, as well as structural elements like steps, walkways, and retaining walls. The drawing would provide detailed information about the layout, dimensions, and architectural features of the sunken courtyard.