River Stone is a natural fluvial stone that has been transported by flowing rivers and streams from mountainous sources to various locations and deposited in river valleys. These stones vary in shape, size, and color.It is a very hard and abrasion-resistant stone, making it suitable for both outdoor and indoor use. River stone is a naturally occurring raw material that is resistant to weather conditions as well as insect and fungal attacks. Sinks of this type are very popular due to their natural appearance and durability.