Top floor boundaryless swimming pool picture

Quick answer：

A boundaryless swimming pool, also known as an infinity pool, is a type of swimming pool designed with one or more sides that appear to have no edge. This creates an optical illusion that the water extends to the horizon, blending the pool with its surrounding landscape. Top floor refers to the highest level of a building. Such pools are often found in luxury homes or hotels, offering a unique view and a sense of exclusivity.