The thickness of the sand in a dry landscape

Quick answer：

The thickness of the sand in a Zen rock garden, also known as a 'kare-sansui,' can vary depending on the designer's intent and the overall aesthetic of the garden. Generally, it ranges from a few centimeters to a few inches to allow for proper drainage and to create the desired visual texture. The sand is raked in specific patterns to represent water currents, and maintaining the correct thickness is crucial for the garden's appearance and functionality.