The Modder River is a river located in the Free State province of South Africa. It is a tributary of the Orange River, which is one of the longest rivers in the country. The Modder River flows through various towns and agricultural areas, providing essential water resources for irrigation and local communities. The river is approximately 200 kilometers long and plays a significant role in the region's ecosystem. It supports diverse wildlife and plant species, contributing to the natural beauty of the area. The Modder River is also important for recreational activities, such as fishing and boating, attracting both locals and tourists.