Japanese water feature

Quick answer：

A Japanese water feature is a traditional element in Japanese gardens, often incorporating elements such as a small pond, a water basin, or stepping stones. These features are designed to reflect the serene and natural beauty of water, and are often accompanied by elements like koi fish, bridges, and wooden lanterns. They serve both a practical purpose of providing a source of water for koi and for irrigation, as well as an aesthetic one, aiming to create a harmonious balance with the surrounding landscape.