The River Birs is a river located in the Canton of Basel-Landschaft in Switzerland. It is approximately 30 kilometers long and flows into the River Rhine. The river is known for its scenic beauty and is surrounded by lush greenery, making it a popular spot for outdoor activities such as hiking and cycling. The Birs has several tributaries and is an important waterway for the local ecosystem. It supports various wildlife species and contributes to the region's biodiversity. The river also plays a role in local agriculture and provides water for irrigation in nearby fields.