River rock is a type of rock that has been smoothed, rounded, and semi-polished by moving water.  Uses for river rock include walkways, riverbeds, borders, edging materials and drainage. These stones contain shades of pink, maroon, beige, browns and grey. River rocks can be found on beaches, in stream beds, and riverbeds, and appear in a wide range of shapes and colors. They’re typically 1 to 10 inches in diameter but can vary in size.