Garden Sunken Courtyard Real Scene

Quick answer：

A sunken courtyard in a garden is a design element where the courtyard is lower in elevation than the surrounding ground level. It often creates a sense of seclusion and privacy, as well as an intimate, enclosed space. These courtyards are typically found in traditional Chinese gardens and other Asian garden designs, where they serve as tranquil retreats, often featuring plants, water elements, and other decorative features.