Endless pool in the mountains hand-drawn

Quick answer：

Endless pools, also known as infinity pools, are architectural features where the pool appears to extend to the horizon, creating an illusion of infinity. Hand-drawn illustrations of such pools are often used in architectural renderings or artistic representations to showcase this unique design element. These pools are typically installed on the edge of a cliff or hillside, offering breathtaking views of the surrounding landscape, such as mountains. The combination of a mountainous setting with an endless pool creates a luxurious and serene environment.