The western sources of the Świder are the initial section of the Świder River, which has its sources in the Żelechowska Upland, near Stoczek Łukowski. This river, approximately 89 km long, is a right tributary of the Vistula and flows through the picturesque areas of the Lublin and Masovian Voivodeships. In 1978, the Świder Nature Reserve was established, covering the section of the river from the village of Dłużew to the mouth of the Vistula, protecting the unique natural and landscape values of this area. The reserve is a popular place among tourists, offering the possibility of walks, observing wildlife and using the blue hiking trail of the Vistula Beaver Trail. For road cyclists, this region is an attractive destination for trips, with numerous routes along the river and in the surrounding forests.