self-circulating water landscape

Quick answer：

Self-circulating water landscapes are water features that use a closed-loop system to recycle water. They are designed to minimize water usage and are often found in urban environments, parks, and gardens. These features can include fountains, pools, and waterfalls, which are kept clean and free of algae through the use of filters and chemicals. They are an environmentally friendly alternative to traditional water features that rely on constant water supply and drainage.