Illustration of an infinity pool in Japan

Quick answer：

An infinity pool, also known as a vanishing edge pool, is a design feature where the water's edge appears to disappear over the horizon, creating the illusion of the pool extending to infinity. In Japan, infinity pools are popular in luxury hotels, resorts, and private homes, often incorporating traditional Japanese garden elements. The design typically involves a raised wall with a glass or transparent barrier to prevent water from spilling out, and the pool's edge is designed to blend seamlessly with the surrounding landscape.