Sunken Courtyard and Courtyard Plan

Quick answer：

A sunken courtyard is a type of courtyard garden design where the courtyard is at a lower level than the surrounding ground. This design creates a sense of privacy and can also provide a microclimate. A courtyard plan is a detailed drawing that shows the layout of the courtyard, including the placement of structures, plants, and other elements. It is an essential tool for landscape architects and garden designers to visualize and plan the space effectively.