Balcony open-air swimming pool image

Quick answer：

An open-air swimming pool situated on a balcony typically refers to a small swimming pool that is built onto or adjacent to a residential balcony. Such pools are designed for private use and can offer a unique outdoor relaxation experience. They may vary in size and design, from small plunge pools to larger lap pools. Balcony pools require careful planning and consideration of factors like structural support, safety, and privacy.