The basics of an infinity pool
An infinity pool gets its name for the seamless blend between the edge of the pool and its surroundings – usually another body of water, such as a sea or lake. This makes it seem like the pool continues into the distance indefinitely.
For this reason, a true infinity pool – also known as a negative edge pool – must be built on sloped ground, to make it look the pool is completely edgeless. In order to achieve this illusion though, the water level needs to flow over the edge of the pool into a weir or secondary pool.