As the name suggests, the oval pool is just a big oval. This shape is usually for pretty big pools, so you'll see it most often in big backyards. Old Victorian houses used to host one of these. This kind of pool shape is one of the standard when you hear people talk about pools as a "backyard oasis." This is partially due to its size, and partially due to how good it looks with palm trees, rock formations, and waterfalls.