Japan has a flat edgeless swimming pool

Quick answer：

An edgeless swimming pool, also known as a infinity pool, is a pool that appears to have no edges or walls, giving the impression that the water extends to the horizon. In Japan, there are several resorts and hotels that offer this unique architectural feature, which combines luxury and stunning views. These pools are often located in high-end resorts and can be found in areas with scenic natural landscapes. They are designed to create a seamless transition from the pool to the surrounding environment, enhancing the overall experience for the swimmer.