I have just learned that an Infinity Pool is one where there is no visible pool edge, so that the water’s “horizon” is all that separates a swimmer from the scenery.
The most spectacular example is the new p0ool in Singapore’s Marina Bay Sands Resort hotel’s Skypark. Members of the public can visit the Skypark and observation deck for a fee.
It is across the top of three buildings comprising a very tall hotel. The pool looks over the ocean and the skyline of Singapore. It would make me nervous to swim near the edge.
But I guess it’s fine unless there’s an earthquake!