The river rocks are a fragment of rock with a smooth, rounded appearance. River rocks are heavily used by homeowners and builders to construct beautiful waterfalls and ponds around. IF you have a garden outside your home then you can think of installing river rocks because people in Australia heavily used river rocks in their gardens. Some people also use them to construct borders in the gardens. The river rocks are erosion products that are transported by rivers by friction with the other fragments and especially with the sand contained in the water, the rocks become smooth. They gradually take on a rounded shape. Â You can get any type and sizes of river rocks as per your requirements.