There are 3 types of pools available on the market today, which are In ground, On ground (half in ground), and Above ground.
In ground: Available in several shapes, and the depth varies from 4 to 10 feet.
On Ground: Available in round or oval models, and the depth varies from 4 to 8 feet.
Above Ground: Available in round or oval models, and the depth varies from 4 to 5.5 feet.